Sbuf serial port buffer register, Tclk | Sonic Alert msm85c154hvs

				INTERNAL SPECIFICATIONS
		Table 4-16 Serial port operation modes

SM0	SM1	Mode	Function	Baud rate

0	0	0	I/O extension	1/12 FOSC

0	1	1	10-bit frame UART	Vareable

1	0	2	11-bit frame UART	1/32 FOSC or 1/64 FOSC

1	1	3	11-bit frame UART	Vareable

Note: FOSC denotes frequency of fundamental oscillator (XTAL1·2).

4.6.2.2 SBUF (serial port buffer register)

SBUF is an 8-bit special function register used to store transmitting and receiving data. Although the SBUF is specified by the same data address 99H for both writing and reading, physically separate registers are specified. That is, the sending circuit SBUF is specified by instructions where SBUF is used as a destination operand, and the receiving circuit SBUF is specified by instructions where SBUF is used as a source operand.

4.6.2.3 TCLK

TCLK controls selection of the baud rate clock source for the transmitting circuit when in mode 1 or 3.

The timer/counter 2 overflow becomes the transmitting circuit baud rate clock source when TCLK is set in mode 1 or 3. And the timer/counter 1 overflow becomes the transmitting circuit baud rate clock source if TCLK is cleared.

TCLK has no effect on the baud rate clock source when in mode 0 or 2. TCLK is located at bit 4 of T2CON (timer/counter 2 control register) specified by data address 0C8H. This bit can also be specified by bit address 0CCH.

4.6.2.4 RCLK

RCLK controls selection of the baud rate clock source for the receiving circuit when in mode 1 or 3.

The timer/counter 2 overflow becomes the receiving circuit baud rate clock source when RCLK is set in mode 1 or 3. And the timer/counter 1 overflow becomes the receiving circuit baud rate clock source if RCLK is cleared.

RCLK has no effect on the baud rate clock source when in mode 0 or 2. RCLK is located at bit 5 of T2CON (timer/counter 2 control register) specified by data address 0C8H. This bit can also be specified by bit address 0CDH.

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Sonic Alert msm85c154hvs, msm83c154s Sbuf serial port buffer register, Tclk, Rclk, Serial port operation modes, SM0 SM1

Contents

MSM80C154S MSM83C154S Page Contents 2.5.3 Reset Schmitt trigger circuit CPU internal status by reset2.5.2 2.5.4 3.1 Power down mode3.4.2 T2EXtimer/counter 2 external flag input detector Special function registers for serial port 101 2.1 140 Multi-processor systems 128129 142 208 KW Pull-Up Resistance Setting for Quasi-bidirectional Input207 210 Introduction Page Introduction MSM80C154S/MSM83C154S/MSM85C154HVS Outline MSM80C154S/83C154S/85C154HVS MSM80C154S/MSM83C154S Features MSM80C154S/83C154S/85C154HVS Additional Features in MSM80C154S/MSM83C154S/MSM85C154HVS MSM80C154S/83C154S/85C154HVS System Configuration Page MSM80C154S/MSM83C154S/MSM85C154HVS Logic Symbols MSM80C154S/MSM83C154S pin layouts MSM80C154SRS/MSM83C154SRS MSM80C154S/MSM83C154S pin layout top view Applicable Packages 1 MSM80C154S/MSM83C154S external dimensions MSM80C154S/MSM83C154S external dimensions MSM80C154STS/MSM83C154STS 2 MSM85C154HVS pin layout and external dimensions MSM85C154HVS pin layout and external dimensions Special Function SignalTIMER/COUNTER 0&1 Interrupt Serial IO Register Address Sense AMP ROM SpecialDPL PLA Register Address TH1 TL1 TH0 TL0 Tmod Tcon Address Decoder Signal DPHT2CON TL2 TH2 AMP ACC TR2 TR1 TH1 TL1 TH0 TL0 Timing and Control Outline of MSM80C154S/MSM83C154S timing Timing 9MSM80C154S/MSM83C154S Major synchronizing signals XTAL1 ALE Psen Inst PORT-0 PCL OUT PORT-2 PCH OUT External program memory read cycle timing chartMovx A, @Rr 12 MSM80C154S Movx @Rr, a execution 13 MSM80C154S Movx A, @DPTR execution PIN Data CPU Data PIN Data Stable Sampled MOV direct, Port 0, 1, 2, 3 executionXTAL1 ALE Psen 4 MSM83C154S fundamental operation time charts 16 MSM83C154S Movx A, @Rr execution 18 MSM83C154S Movx A, @DPTR execution 19 MSM83C154S Movx @DPTR, a execution PIN Data PIN Data Stable CPU Data Sampled 20 MSM83C154S MOV direct, PORT0, 1, 2, 3 execution PLA Wair Instruction Register IR and Instruction Decoder PLAAIR PLA WIR Arithmetic Operation Section PSW0D0H CY AC F0 RS1 RS0 OV F1 P Program Counter CPU Internal Data BUS Program Memory and External Data Memory 24 MSM80C154S/MSM83C154S program area ALE Latch System Configuration Dptr XTAL1 ALE Psen Page MSM80C154S/MSM83C154S By register R0 or R1 Data Control Page Crystal resonator connection diagram Oscillators XTAL1 XTAL2 Supply of 50% duty clock Clock XTAL2 Outline CPU ResettingCPU Reset Control ROM mode 5Resetexecution Chart Chart XTAL1 Psen ALE MSM80C154S/83C154S/85C154HVS Reset Schmitt trigger circuit Reset Schmitt trigger gate detector time chart MSM80C154S/MSM83C154S reset internal status CPU internal status by resetDenotes direct resetting even if XTAL1·2 has stopped EA CPU Memory Separate Internal Specifications Page Internal Specifications Internal Data Memory RAM and Special Function Registers Data memory and special function register layout Internal Data Memory RAM Internal data memory RAM RAM layout diagram RS0 Internal data memory registers R0 thru R7Program status word PSW User Data RAM PC5 MSM80C154S/83C154S/85C154HVS StackStack storage layout PC1 Lnternal Data Memory RAM Operating Procedures Internal data memory indirect addressing DEC Rr bit arrangement Register designation table Internal data memory 1-bit data designation CLR bit address bit arrangement 2AH 2BH Bit designation tableAddressing combination table 2EH Special Function Registers TCON, SCON,.... ACC, B List of special function registers Special function registers 4.4.2.1 Timer mode register Tmod MSM80C154S/83C154S/85C154HVS Power control register Pcon Timer control register Tcon SM0 SM1 SM2 REN TB8 RB8 SCON.6 SM1 SM0 ModeMSB LSB Scon SCON.0 ET2 ET1 EX1 ET0 EX0 Interrupt enable register IEMSB LSB ET2 PCT MSM80C154S/83C154S/85C154HVS Interrupt priority register IPPCT PT2 PT1 PX1 PT0 PX0 Program status word register PSW MSM80C154S/83C154S/85C154HVS 2.8 I/O control register Iocon EXEN2 Timer 2 control register T2CONTF2 EXF2 TF2 Timer/counter 0 and 1 counting control Timer/Counters 0, 1 and 2 4.5.1 OutlineTimer/counters 0 and 1 4.5.2.1 Outline Timer control register Tcon 88H Circuit for timer/counters 0 Overall clock input control Timer mode register Tmod 89H PD & HPD External clock detector circuit for timer/counters 0Timer Counting control of timer/counters 0 and 1 by INT pin Detector circuit operational time chart Detector Timer ClockTimer Gate TR0 INT0 RUN Stop TR1 INT1 Mode 11 Timer mode register Tmod 89HTimer Counter T1 PIN Detector Port TR1 Gate INT1 PIN Data T0 PIN Detector Port TR0 Gate INT0 PIN DataDetector TF0 TL0 TH0 5BITS 8BITS Latch Detector TF1 TL1 TH1 5BITS 8BITS O Clock MSM80C154S/83C154S/85C154HVS Mode Latch Detector TF1 Detector TF0TH0 8BITS TH1 8BITS O Clock MSM80C154S/83C154S/85C154HVS Mode INT0 PIN 8BITS Data T0 PIN Detector Port TF08BITS TR0 Gate Reload Data Xtal TL0 8BITS Detector TF1 Detector TF0 T0 PIN Detector Port TR0 Gate INT0 PIN DataLatch Xtal TH0 C 8BITS Iocon 0F8H 2.5.6 32-bit timer modeT0 PIN Detector Serr IZC Timer Reset 19 T0, T1 external clock detector circuit Internal Specifications Bit is 0, and valid when Mode 1 or 3 has been set12 Timer 2 control register T2CON 0C8H 3.3.1 16-bit auto reload mode Must be reset to 0 by softwareTimer/counter 2 operation modes To 0 by software RCLK=0 TCLK=0 3.3.2 16-bit capture modeTR2 Detector EXEN2 RCAP2L RCAP2H TF2 Timer EXF2 Interrupt TL2 TH2 BIT 3.3.3 16-bit baud rate generator mode 21 Timer/counter 2 16-bit capture mode circuit Baud Reset Timer Counter T2EX 3.4.2 T2EX timer/counter 2 external flag input detectorReset Timer Counter Clock Timer/counter detector circuit Detector PD & HPD O Clock Serial Port Sbuf R 100RX Control Input Shift Register Internal Specifications 102 15 Scon Rclk Sbuf serial port buffer registerTclk 16 Serial port operation modes MSM80C154S/83C154S/85C154HVS Smod Serr Mode 0 receive operation Mode 0 baud rateMode 0 transmit operation Port mode 107 108 Serial port modeTiming chart 109 MSM80C154S/83C154S/85C154HVS Mode Outline Mode 1 baud rate Mode 1 transmit operation Mode 1 receive operation MSM80C154S/83C154S/85C154HVS Mode 1 Uart error detection Start Serr RXD Internal BUS TIMER/COUNTER1 SMOD=1 Overflow SMOD=0113 114 Mode 2 transmit operation Mode OutlineMode 2 baud rate Mode 2 receive operation Mode 2 Uart error detection Internal BUS Write Start TBB Sbuf TXD To Sbuf Baud Rate SMOD=1 Clock XTAL1·2 Couter SMOD=0 Serial Port 118 Mode 3 baud rate Mode 3 transmit operation Mode 3 receive operation Mode 3 Uart error detection 122 123 RXD PX.X TXD QHSHIFT/ Load Serial ClockInhibit F E D C B a Input RX.X TXD RXD TXD PX.X Qhqg QF QE Qdqc QB QACLK PX.X RXD TXD Output PX.X Control 126SHIFT/ Load Serial Clock RXD Input PX.X Control TXD 42 lnput/output extension example timing chart 127 Master Slave MSM80C154S/83C154S/85C154HVS Multi-processor systemsTXD RXD Interrupt 18 lnterrupt addresses Equivalent circuit 130Interrupt control 19 lnterrupt enable register IE, 0A8H ET1 PX1 20 nterrupt priority register IP, 0B8H Priority interrupt routine flow Clrea 21 Non-priority interrupt order of preference TF1 TR1 TF0 External interrupt signal 0 and 1 level detection22 TCON88H register IE1 IT1 IE0 IT0 External interrupt signal 0 and 1 trigger detection BUS Tcon ResetPage 139 Page 141 Page 143 Page 145 CPU Power Down Idle mode Idle setting Xtal Control PCON, 87H Smod HPD RPD GF1 GF0 IDL Xtal TIMER, S-I/O Interrupt147 23 CPU pin details in idle mode 148 Idle 149 55Idlemodesettingtime 150 Soft power down mode PD setting CPU Clock Mode equivalent circuit152 Pcon 87H Control Smod HPD RPD GF1 PCON5RPD Pdreset PdresetReset END 153 TIMER0 154 24 CPU pin details ALF=0 in soft power down mode PD 155 156 Soft power down mode settingTime chart internal ROM mode Soft 25 CPU pin details ALF=1 in soft power down mode PD 158 Down 159 63Softpowerdownmodesetting 160 Hard power down mode HPD setting Xtal Hpdi Control Pcon 87H Smod HPD RPD GF1 GF0 IDL Hard power down162 26 CPU pin details ALF=0 in hard power down mode HPD 163 164 Mode 165 27 CPU pin details ALF=1 in hard power down mode HPD 166 167 68Hardpowerdownmodesetting 168 Cancellation by CPU resetting Reset pin MSM80C154S/83C154S/85C154HVS By reset internal ROM mode170 171 172 By reset external ROM mode 173 Mode by reset internal ROM mode 174 Mode by reset external ROM mode 175 29 Power control register Pcon 87H Smod HPD RPD GF1 GF0 IDL IDLE, PD Mode Interrupt Restart 177 INT 179 Internal ROM mode 180 181 IDLE, PD Mode Restart Mode SET Smod HPD RPD GF1 GF0 OUT Level Sense 184 Restart from idle mode byOr 1 external ROM mode Or 1 internal ROM mode 185 External ROM mode 186 Internal Specifications Back up with hard power down mode 188 189 Back INPUT/OUTPUT Ports 190Page Port 0 internal equivalent circuit OutlinePort WPO Modify 193Internal BUS Read 194 Port 0 pin table Port Port 1 internal equivalent circuit 196Control Modify Port Read WP1 Internal BUS Read OFF 197OFF 198 199 On P3 On P2 Internal BUS Readoff N Port 1 pin table 200Port 1 CPU control pin table Port 2 internal equivalent circuit PC/DATADPH Port Read Modify WP2 Control 202 PORT2 Internal BUS Control Modify Read Data WP3 Port 3 pin table 204Port 3 CPU control pin function table INPUT/OUTPUT Ports Modify Port Read Internal BUS Power Down Iocon 0F8H206 INPUT/OUTPUT Ports CPU 1 OUT 12 NPN transistor direct connection circuit 209 CPU 0 OUT Port Output Timing One machine cycle instruction output timing 16 Two machine cycle instruction port output time chart Two machine cycle instruction output timing Port Data Manipulating Instructions 213 MSM80C154/83C154/85C154 214 Electrical Characteristics Absolute Maximum Ratings Operational Ranges Port 0, ALE, Psen DC CharacteristicsVCC=4.0 to 6.0V,VSS=0V, Ta=-40C to +85C SSV IV CC 218 DC Characteristics 219 Measuring circuits Repeated for specified input pinsRepeated for specified output pins Input logic for specified status External Program Memory Access AC Characteristics ALE Psen Port 222External program memory read cycle Instr External Data Memory Access AC Characteristics Output External data memory write cycle 224External data memory read cycle Output Data Setup to Clock Rising Edge TQVXH 226 Machine Cycle ALE Shift Clock Output Data Input Data Floating AC Characteristics Measuring ConditionsInput/output signal Test Point Exterminal Oscillator Signal XTAL1 External Clock Input Waveform Conditions Description of Instructions Page Description of Instructions Description of Instruction Symbols Instruction table List of InstructionsMSM80C154S/MSM83C154S Simplified Description of Instructions Address in this description 235 CLR a CPL a RL a RLC a RR a RRC a Swap a 236 XRL MOV CLR 238MOV Dptr Setb 239 Movc A, @A+PC 240 Sjmp Interrupt Enable AjmpLjmp JMP @A+DPTR 242 Then Else Cjne 243 Then Else Djnz 244 Movx A, @DPTR 245External RAM NOP Detailed Description of MSM80C154S/MSM83C154S Instructions Acall code address Absolute call within 2K bytes RS1 ADD A, #data Add immediate data247 MSM80C154S/83C154S/85C154HVS ADD A, @Rr Add indirect address 248 ADD A, Rr Add register 249 MSM80C154S/83C154S/85C154HVS ADD A, data address Add memory 250 Addc A, #data Add carry plus immediate data to accumulator 251 252 ADD A, Rr Add carry plus register to accumulator 253 254 Ajmp code address Absolute jump within 2K byte 255 256 ANL A, @Rr Logical and indirect address to accumulator 257 258 ANL A, data address Logical and memory to accumulator 259 260 ANL C,/bit address Logical and complement bit to carry flag 261 262 ANL data address, a Logical and accumulator to memory 263 264 Testajmp TEST1 265LOC OBJ Source Compcjne @R1, #05H, Test 266 SS1MOV R7, a 267Cjne A, #0AH, SS1 LOC OBJ Source Compcjne A, #0AH, SS1 268 Compcjne A, 50H, Next 269Cjne A, 50H, Next LOC OBJ Source Callcall Test 270 Compared data is not equal. If the compared data is equal 271 Countinc R4 MSM80C154S/83C154S/85C154HVS CLR a Clear accumulator 272 CLR C Clear carry flag 273 MSM80C154S/83C154S/85C154HVS CLR bit address Clear bit 274 CPL a Complement accumulator 275 MSM80C154S/83C154S/85C154HVS CPL C Complement carry flag 276 CPL bit address Complement bit 277 MSM80C154S/83C154S/85C154HVS DA a Decimal adjust accumulator 278 279 280 DEC a Decrement accumulator 281 MSM80C154S/83C154S/85C154HVS DEC Rr Decrement register 282 DEC data address Decrement memory 283 AC F0 RS1 RS0 OV F1 MSM80C154S/83C154S/85C154HVS DIV AB Divide accumulator by B284 285 Loopadd A, R7 286Djnz R1, Loop LOC OBJ Source Countdjnz R1, Loop 287 Countdjnz 57H, Loop 288Djnz 57H, Loop LOC OBJ Source INC @Rr Increment indirect address 289 MSM80C154S/83C154S/85C154HVS INC a Increment accumulator 290 RS1 RS0 PSW INC Dptr Increment data pointer291 DPH DPL MSM80C154S/83C154S/85C154HVS INC Rr Increment register 292 INC data address Increment memory 293 294 ACA0 Entermov R4, 0A0H 295Bittsjb 34.3, Enter 296 297 298 Jmpcjc Carry 299Checkacall Addr Carryinc @R1 300 Byte Description JNB bit address, code address Jump if bit is not set 301 Exitmov A, @R0 302Testjnb 37.3, Exit JNC code address Jump if carry is not set 303 Exitmov B, ACC 304Testjnc Exit JNZ code address Jump if accumulator is not 305 Checkjnz Test 306JNZ Test LOC OBJ Source Testmov R3, a JZ code address Jump if accumulator is not 307 Emptyinc a 308JZ Empty LOC OBJ Source Checkjz Empty Lcall code address Long call 309 MSM80C154S/83C154S/85C154HVS Ljmp code address Long jump 310 6AH MOV @Rr, #data Move immediate data to indirect address311 312 6CH MOV @Rr, data address Move memory to indirect address 313 314 MOV A, @Rr Move indirect address to accumulator 315 316 MOV A, data address Move memory to accumulator 317 318 DPH·DPL MOV DPTR, #data Move immediate data to data pointer319 320 MOV Rr, a Move accumulator to register 321 322 5AH MOV bit address, C Move carry flag to bit 323 324 MOV data address, @Rr Move indirect address to memory 325 326 6BH MOV data address, Rr Move register to memory327 328 329 Movc A, @A+DPTR 330 331 62CCH 332 57AFH 333DPL DPH 334 MUL AB Multiply accumulator by B 335 MSM80C154S/83C154S/85C154HVS NOP No operation 336 ORL A, #data Logical or immediate data to accumulator 337 338 ORL A, Rr Logical or register to accumulator 339 340 ORL C, bit address Logical or bit to carry flag 341 342 ORL data address, #data Logical or immediate data to memory 343 344 POP data address Pop stack to memory 345 346 RET Return from subroutine, non interrupt 347 348 RS1 RS0 OV F1 P PSW RL a Rotate accumulator left349 350 RR a Rotate accumulator right 351 352 Setb C Set carry flag 353 MSM80C154S/83C154S/85C154HVS Setb bit address Set bit 354 Sjmp code address Short jump 355 Checkrlc a 356Sjumpsjmp Check 357 358 Subb A, Rr Substract register from accumulator with borrow 359 360 Swap a Exchange nibble in accumulator 361 362 XCH A, Rr Exchange register with accumulator 363 364 7AH 365 366 367 368 369 370 371