IBM EM78P809N manual Timer Mode, Counter Mode, Window Mode

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EM78P809N

8-Bit Microcontroller

4.9.1 Timer Mode:

In Timer mode, counting up is performed using the internal clock. When the contents of the up-counter matched with the TCR2 (TCR2H+TCR2L), then interrupt is generated and the counter is cleared. Counting up resumes after the counter is cleared.

Internal clock

Up-counter	0 1	2	3	4	5	n-3 n-2 n-1	n 0 1 2	3
TCR2	n					match	counter
						match	counter
							clear

TC2 interrupt

Fig. 20. Timer Mode Timing Chart

4.9.2 Counter Mode:

In Counter mode, counting up is performed using the external clock input pin (TC2 pin) and either rising or falling can be selected by setting TC2ES. When the contents of the up-counter matched with the TCR2 (TCR2H+TCR2L), then interrupt is generated and the counter is cleared. Counting up resumes after the counter is cleared.

TC2 Pin

Up-counter	0 1	2	3	4	n-2	n-1 n 0	1 2	3
TCR2	n					match	counter
						match	counter
							clear

TC2 interrupt

Fig. 21. Counter Mode Timing Chart (TC2ES = 1)

4.9.3 Window Mode

In Window mode, counting up is performed on the rising or falling edge of the pulse that is logical AND of an internal clock and the TC2 pin (window pulse). When the contents of the up-counter matched with the TCR2 (TCR2H+TCR2L), then interrupt is generated and the counter is cleared. The frequency (window pulse) must be slower than the selected internal clock.

Writing to the TCR2L, the comparison is inhibited until TCR2H is written.

Product Specification (V1.0) 07.26.2005

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(This specification is subject to change without further notice)

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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 01hBit 7 ~ Bit 6 RBS1 ~ RBS0 R-Register page select R3/SR − Status Register Address 03hBit 5 Not used RBS1 RBS0Bit 0 C Carry flag R4/RSR − RAM Select Register Address 04h GRBS1 GRBS0General Purpose Register Bank Address 20H ~ 3FH PORT6 − Port 6 I/O Data Register Address 06h SIS = 0 Idle mode SIS = 1 Sleep modePORT7 Port 7 I/O Data Register Address 07h PORT8 − Port 8 I/O Data Register Address 08hTC4S = 1 Start TC4CR Timer/Counter 4 Control Register Address 0BhTC4FF1 TC4FF0 TC4CK2 TC4CK1 TC4CK0ISFR1 − Interrupt Status Flag Register 1 Address 0Eh Bit Microcontroller TC4D − Timer 4 Data Buffer Address 0ChTC3CAP = Bit 7 TC3CAP Software capture controlTC3S = 1 Start TC3CAP TC3S TC3CK1 TC3CK0 TC3MTC2M = 1 Window mode TC3DB − Timer 3 Data Buffer B Address 07hBit 7 ~ Bit 6 ADD1 ~ ADD0 AD low 2-bit data buffer TC2S = 1 StartTC2DH − Timer 2 Data Buffer High Byte Address 09h TC2DL − Timer 2 Data Buffer Low Byte Address 0AhAdcr − AD Control Register Address 0Bh Bit 7 ~ Bit 0 ADE7 ~ ADE0 AD input pin enable control Bit 3 ADP AD power controlAdic − AD Input Pin Control Address 0Ch Addh − AD High 8-bit Data Buffer Address 0DhTEN = 0 Disable TEN = 1 Enable Bit 7 TEN Keytone enable controlBit 3 Tbten Time Base Timer Enable Control Bit Microcontroller Tbktc − TBT/Keytone Control Address 0EhUinven = 0 Disable TXD and RXD port inverse output Bit 3 Uinven Enable Uart TXD and RXD port inverse outputUinven = 1 Enable TXD and RXD port inverse output Bit 4 ~ Bit 2 BRATE2 ~ BRATE1 Transmit Baud Rate SelectBit 5 PRE Enable parity addition Bit Microcontroller URS − Uart Status Register Address 07hEven = 0 Odd parity Even = 1 Even parity EDS = 0 Rising edge EDS = 1 Falling edge Bit 2 EDS Data shift out edge selectSMP Dcol BRS2 BRS1 EDS Dord WBESPIC2 − SPI Control Register 2 Address 06h Transfer ModeSpid SPI Data Buffer Address 07h SPID7 SPID6 SPID5 SPID4 SPID3 SPID2 SPID1 SPID0PLC1 Pull Low Control Register 1 Address 0Bh PLE7x = 1 Disable P7x pull lowPHC2 − Pull High Control Register 2 Address 0Ch PLC2 − Pull Low Control 2 Address 0DhAccumulator Special Purpose RegistersControl Register Bit 7 Wdto WDT output selectIntcr − INT Control Register Address 0Bh Bit Microcontroller IOC6 ~ IOC9 − I/O Port Control RegisterBit 2 Reserved INT1ES = 0 Rising edge INT1ES = 1 Falling edgeExternal Interrupt INT Pin Secondary Enable Condition Function PinAdoscr − AD Offset Control Register Address 0Ch EdgeUerrie Urie Utie Tbie EXIE1 TCIE0 IMR2 − Interrupt Mask Register 2 Address 0FhRegisters for CPU operation mode CPU Operation ModeRbank Register Bank bits 7, 6 of R3, R/W Read/Write RbankMode 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 Transfer Mode Shift Direction and Sample PhaseBit Transmit Mode Serial Clock Bit 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 Reset Type Previous value before resetStatus of RST, T, and P of Status Register Bit Microcontroller General Purpose RegistersInterrupt Controller Reset Block DiagramOscillator Modes OscillatorCrystal Oscillator/Ceramic Resonators Crystal Summary of Maximum Operating SpeedsEM78P809N Oscillator Type Frequency Mode C1 pF C2 pFExt. Clock 740Crystal/Resonator-Parallel Mode Circuit External RC Oscillator ModeCode Option Register Enwdtb = 0 Enable Enwdtb = 1 DisableCode Option Register Word For design reference onlyExternal Power-on Reset Circuit Power-on ConsiderationsCustomer ID Register Cyes = 0 One cycle Cyes = 1 Two cyclesVdd Residue-Voltage ProtectionEM78P809N Rin Vdd EM78P809NVdd 40KR2 Instruction SetDEC Binary Instruction Hex Mnemonic Operation Status AffectedAbsolute Maximum Ratings Symbol Parameter Condition Min Typ Max UnitRecommended Operating Conditions Vss =DC 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 Symbol Parameter Conditions Min Typ Max Unit AC Electrical CharacteristicTa=- 40C ~ 85 C, VDD=5V ± 5%, VSS=0V = selected prescaler ratioAC Test Input/Output Waveform Timing DiagramPackage Types OTP MCUPin Count Package Size Contents III EM78P809N