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IBM EM78P809N manual Special Purpose Registers, Accumulator, Control Register

Models: EM78P809N

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EM78P809N

8-Bit Microcontroller

4.3 Special Purpose Registers

A(Accumulator)

Internal data transfer, or instruction operand holding.

It cannot be addressed.

CONT (Control Register)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

WDTO

/INT

WDTP1

WDTP0

WDTE

PSR2

PSR1

PSR0

CONT register is both readable and writable.

Bit 7 ( WDTO ) : WDT output select

WDTO = “0” : Interrupt request

WDTO = “1” : Internal reset

Bit 6 ( /INT ) : Interrupt enable flag

/INT = “0” : masked by DISI or hardware interrupt

/INT = “1” : enabled by ENI/RETI instructions Bit 5 ~ Bit 4 ( WDTP1 ~ WDTP0 ) : WDT prescaler bits.

WDTP1		WDTP0		Operating Mode
0		0		1:4

0		1		1:16

1		0		1:64

1		1		1:256

Bit 3 ( WDTE ) : WDT enable control.

WDTE = “0” : Disable

WDTE = “1” : Enable

Bit 2 ( PSR2 ) ~ Bit 0 ( PSR0 ) : TCC prescaler bits.

	PSR2		PSR1		PSR0		Operating Mode

	0		0		0		1:2

	0		0		1		1:4

	0		1		0		1:8

	0		1		1		1:16

	1		0		0		1:32

	1		0		1		1:64

	1		1		0		1:128

	1		1		1		1:256


Product Specification (V1.0) 07.26.2005							• 23

(This specification is subject to change without further notice)

Image 27

IBM EM78P809N manual Special Purpose Registers, Accumulator, Control Register, Bit 7 Wdto WDT output select

Contents

DOC. Version EM78P809NElan Microelectronics Corporation Contents Specification Revision History Bit Microcontroller CPU„ General purpose ApplicationsPin Assignment OTP Programming Pins Function Description Functional Block DiagramTbktc Operating RegistersR2/PC − Program Counter & Stack Address 02h R1/TCC − Time Clock /Counter Address 01hRBS1 RBS0 R3/SR − Status Register Address 03hBit 7 ~ Bit 6 RBS1 ~ RBS0 R-Register page select Bit 5 Not usedBit 0 C Carry flag R4/RSR − RAM Select Register Address 04h GRBS1 GRBS0General Purpose Register Bank Address 20H ~ 3FH PORT8 − Port 8 I/O Data Register Address 08h SIS = 0 Idle mode SIS = 1 Sleep modePORT6 − Port 6 I/O Data Register Address 06h PORT7 Port 7 I/O Data Register Address 07hTC4CK2 TC4CK1 TC4CK0 TC4CR Timer/Counter 4 Control Register Address 0BhTC4S = 1 Start TC4FF1 TC4FF0ISFR1 − Interrupt Status Flag Register 1 Address 0Eh Bit Microcontroller TC4D − Timer 4 Data Buffer Address 0ChTC3CAP TC3S TC3CK1 TC3CK0 TC3M Bit 7 TC3CAP Software capture controlTC3CAP = TC3S = 1 StartTC2S = 1 Start TC3DB − Timer 3 Data Buffer B Address 07hTC2M = 1 Window mode Bit 7 ~ Bit 6 ADD1 ~ ADD0 AD low 2-bit data bufferTC2DH − Timer 2 Data Buffer High Byte Address 09h TC2DL − Timer 2 Data Buffer Low Byte Address 0AhAdcr − AD Control Register Address 0Bh Addh − AD High 8-bit Data Buffer Address 0Dh Bit 3 ADP AD power controlBit 7 ~ Bit 0 ADE7 ~ ADE0 AD input pin enable control Adic − AD Input Pin Control Address 0ChBit Microcontroller Tbktc − TBT/Keytone Control Address 0Eh Bit 7 TEN Keytone enable controlTEN = 0 Disable TEN = 1 Enable Bit 3 Tbten Time Base Timer Enable ControlBit 4 ~ Bit 2 BRATE2 ~ BRATE1 Transmit Baud Rate Select Bit 3 Uinven Enable Uart TXD and RXD port inverse outputUinven = 0 Disable TXD and RXD port inverse output Uinven = 1 Enable TXD and RXD port inverse outputBit 5 PRE Enable parity addition Bit Microcontroller URS − Uart Status Register Address 07hEven = 0 Odd parity Even = 1 Even parity EDS Dord WBE Bit 2 EDS Data shift out edge selectEDS = 0 Rising edge EDS = 1 Falling edge SMP Dcol BRS2 BRS1SPID7 SPID6 SPID5 SPID4 SPID3 SPID2 SPID1 SPID0 Transfer ModeSPIC2 − SPI Control Register 2 Address 06h Spid SPI Data Buffer Address 07hPLC2 − Pull Low Control 2 Address 0Dh PLE7x = 1 Disable P7x pull lowPLC1 Pull Low Control Register 1 Address 0Bh PHC2 − Pull High Control Register 2 Address 0ChBit 7 Wdto WDT output select Special Purpose RegistersAccumulator Control RegisterINT1ES = 0 Rising edge INT1ES = 1 Falling edge Bit Microcontroller IOC6 ~ IOC9 − I/O Port Control RegisterIntcr − INT Control Register Address 0Bh Bit 2 ReservedEdge INT Pin Secondary Enable Condition Function PinExternal Interrupt Adoscr − AD Offset Control Register Address 0ChUerrie Urie Utie Tbie EXIE1 TCIE0 IMR2 − Interrupt Mask Register 2 Address 0FhRbank CPU Operation ModeRegisters for CPU operation mode Rbank Register Bank bits 7, 6 of R3, R/W Read/WriteMode Switching Control Operation ModeNormal AD Converter → Don’t care → Interrupt request flag will be recordedRegisters for AD Converter Circuit ADC Data Register Sampling TimeConversion Time Time Base Timer and Keytone Generator ADCK10Max. Frequency Max. Conversion Rate per Bit Tone Output Pin Timing Chart Uart Universal Asynchronous Receiver/Transmitter Registers for Uart CircuitRbank Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit Data Format in Uart Uart ModeReceiving TransmittingSPI Serial Peripheral Interface Baud Rate GeneratorRegisters for the SPI Circuit Serial Clock Shift Direction and Sample PhaseTransfer Mode Bit Transmit ModeBit Transmit/Receive Mode Bit Microcontroller Bit Receive ModeMultiple Device Connect /SS SCK pinTimer/Counter Registers for Timer/Counter 2 CircuitRbank Address Name Bit 7 Bit 6 Bit Timer Mode Counter ModeWindow Mode Registers for Timer/Counter 3 Circuit Window Mode Timing ChartConfiguration of Timer/Counter3 Capture modeTCIF4 Registers for Timer 4 CircuitTCR4 PDO ModePWM Mode 12 TCC/WDT & PrescalerTC4 Interrupt Reset and Wake-up Reset13 I/O Ports Wake-up from Sleep Mode Wake-up from Idle modeAll interrupt Summary of the Initialized Values for Registers Address Name Reset Type BitSCR Bit Microcontroller Register BankTC2D9 TC2D8 Register Bank Bit Microcontroller General Purpose Registers Previous value before resetReset Type Status of RST, T, and P of Status RegisterInterrupt Controller Reset Block DiagramSummary of Maximum Operating Speeds OscillatorOscillator Modes Crystal Oscillator/Ceramic Resonators Crystal740 Oscillator Type Frequency Mode C1 pF C2 pFEM78P809N Ext. ClockCrystal/Resonator-Parallel Mode Circuit External RC Oscillator ModeFor design reference only Enwdtb = 0 Enable Enwdtb = 1 DisableCode Option Register Code Option Register WordCyes = 0 One cycle Cyes = 1 Two cycles Power-on ConsiderationsExternal Power-on Reset Circuit Customer ID RegisterVdd EM78P809N Residue-Voltage ProtectionVdd EM78P809N RinVdd 40KR2 Instruction SetDEC Binary Instruction Hex Mnemonic Operation Status AffectedVss = Symbol Parameter Condition Min Typ Max UnitAbsolute Maximum Ratings Recommended Operating ConditionsDC Electrical Characteristics Ta= 25 C, VDD= 5.0V ± 5%, VSS=Typical value is based on characterization results at 25C Ta= 25 C, VDD= 3.0V ± 5%, VSS= Varef = selected prescaler ratio AC Electrical CharacteristicSymbol Parameter Conditions Min Typ Max Unit Ta=- 40C ~ 85 C, VDD=5V ± 5%, VSS=0VAC Test Input/Output Waveform Timing DiagramPackage Types OTP MCUPin Count Package Size Contents III EM78P809N