IBM EM78P312N manual 13 I/O Ports, Reset and Wake-up

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EM78P312N

8-Bit Microcontroller

5.13 I/O Ports

The I/O registers, Port 6, Port 7, Port 8, and Port 9 are bi-directional tri-state I/O ports. Each I/O pin can be defined as “input” or “output” pin by the I/O control register (IOC6 ~ IOC9). The I/O registers and I/O control registers are both readable and writable. The I/O interface circuits for Port 6, Port 7, Port 8, and Port 9 are shown in Fig. 5-26.

		PCRD
	Q	P	D
		R	D
		R	CLK	PCW R
	Q	C	CLK	PCW R
		C
		L
		L
PORT	Q	P		IOD
PORT	Q	P	D
		R	D
		R		PDW R
	Q	C CLK		PDW R
	Q	L
		L
0	M			PDRD
1	U
1	X

Fig. 5-27 The I/O Port and I/O Control Register Circuit

5.14 Reset and Wake-up

5.14.1 Reset

A reset is initiated by one of the following events:

(1)Power-on reset

(2)/RESET pin input “low”

(3)WDT timeout. (if enabled)

The device is kept in a reset condition for a period of approx. 18ms1 (one oscillator start-up timer period) after the reset is detected. Once a reset occurs, the following functions are performed.

The oscillator starts or is running

The Program Counter (R2) is reset to all “0”.

When power is switched on, the upper two bits of R3, the upper two bits of R4 and the Bits 6 ~ 4 of R5 are cleared.

All I/O port pins are configured as input mode (high-impedance state).

1 Note: VDD = 5V, set up time period = 16.2ms ± 30% VDD = 3V, set up time period = 19.6ms ± 30%

42 •	Product Specification (V1.0) 10.03.2006

(This specification is subject to change without further notice)

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Contents EM78P312N DOC. VersionElan Microelectronics Corporation Contents 16.2 14.116.1 16.3General Description Bit MicrocontrollerSymbol Pin No Type Function Pin DescriptionFunctional Block Diagram Function DescriptionOperating Registers Operating RegistersR1 Time Clock /Counter Bit Microcontroller R0 Indirect Addressing RegisterR2 Program Counter & Stack Bit 7 ~ Bit 6 RBS1 ~ RBS0 R-Register page select User Memory SpaceR3 Status Register RBS1 RBS0Bit 0 C Carry flag R4 RAM Select Register Bit 1 SIS Sleep and Idle mode selectSIS = 0 Idle mode SIS = 1 Sleep mode R5 System Control RegisterBit 7 ~ Bit 0 P67 ~ P60 8-bit Port 6 I/O data register RB Timer/Counter 4 Control RegisterBit Microcontroller R6 Port 6 I/O Data Register R7 Port 7 I/O Data RegisterTC4CK2 TC4CK1 TC4CK0 RC Timer 4 Data BufferClock Source Resolution Max. Time Fosc=8MBit Microcontroller RE Interrupt Status Flag Register RFInterrupt Status Flag RegisterBank 1 R7 TC3DB Timer 3 Data Buffer B Bank 1 R5 TC3CR Timer/Counter 3 Control RegisterTC3M = 1 Capture mode Bank 1 R6 TC3DA Timer 3 Data Buffer a Bit 7 TC3CAP Software capture controlTC2S = 0 Stop and counter clear Bank 1 R9 TC2DH Timer 2 Data Buffer High ByteBank 1 RA TC2DL Timer 2 Data Buffer Low Byte Bank 1 RB Adcr AD Control RegisterBank 1 RC Adic AD Input Pin Control Bit 7 ~ Bit 0 ADE7 ~ ADE0 AD input pin enable controlBit 5~ Bit 4 ADCK1 ~ ADCK0 AD Conversion Time Select Bank 1 RD Addh AD High 8-bit Data BufferBank 2 R5 URC1 Uart Control Register TEN = 0 Disable TEN = 1 EnableBit Microcontroller Bank 1 RE Tbktc TBT/Keytone Control BitBRATE2 BRATE1 BRATE0 Bank 2 R7 URS Uart Status RegisterBit 7 URRD8 Receiving data Bit TC2CK1 TC2CK0Even = 0 Odd parity Even = 1 Even parity Bit 5 PRE Enable parity additionBit 6 Even Select parity check Bank 2 R9 Urtd Uart Transmit Data BufferEDS = 0 Rising edge EDS = 1 Falling edge Bit 5 ~ Bit 3 BRS0 ~ BRS2 SPI Clock Source SelectBit 2 EDS Data shift out edge select Bit 0 WBE Write buffer empty flag. Read onlyBank 3 RB PLC1 Pull Low Control Register PHE6x = 1 Disable P6x pull highTransfer Mode SPID7 SPID6 SPID5 SPID4 SPID3 SPID2 SPID1 SPID0Special Purpose Registers INT1ES = 0 Rising edge INT1ES = 1 Falling edge IOC6 ~ IOC9 − I/O Port Control RegisterIntcr − INT Control Register Address 0Bh TC2ES = 0 Rising edge TC2ES = 1 Falling edgeAdoscr − AD Offset Control Register Address 0Ch External InterruptCali Sign IMR2 − Interrupt Mask Register 2 Address 0Fh Uerrie Urie Utie Tbie EXIE1 TCIE0Mode Switching Control CPU Operation ModeRegisters for CPU Operation Mode Operation ModeAD Converter Sleep Mode Idle ModeWake-up Signal R5 SIS = 1+SLEP R5 SIS= 0 + Slep Instruction Wake-up MethodsSampling Time Operation Mode Max. Frequency Max. Conversion Rate per BitADC Data Register Conversion TimeTime Base Timer and Keytone Generator Address Name BitMUX Registers for Uart Circuit Uart Universal Asynchronous Receiver/TransmitterName Bit Uart Mode TransmittingReceiving Baud Rate GeneratorRegisters for the SPI Circuit SPI Serial Peripheral InterfaceRbank Address Name Bit Bit Transmit Mode Shift Direction and Sample PhaseTransfer Mode Serial ClockBit Transmit/Receive Mode Bit Microcontroller Bit Receive ModeSCK pin Spis Multiple Device Connect /SSTimer/Counter Registers for Timer/Counter 2 CircuitCounter Mode Timer ModeWindow Mode Registers for Timer/Counter 3 Circuit 21 Window Mode Timing ChartCapture Mode 22 Configuration of Timer/Counter3Registers for Timer 4 Circuit TCIF4PDO Mode TCR4Up-counter PWM Mode12 TCC/WDT & Prescaler TC4 InterruptReset Reset and Wake-up13 I/O Ports Wake-up from Sleep Mode Wake-up from Idle ModeAddress Name Reset Type Bit Summary of the Initialized Values for RegistersBit Microcontroller Register Bank SCRAddres URTD8 Bit Microcontroller General Purpose Registers Reset TypeStatus of RST, T, and P of the Status Register Events that may affect the T and P Status28 Controller Reset Block Diagram InterruptCrystal Oscillator/Ceramic Resonators Crystal OscillatorOscillator Modes Summary of Maximum Operating SpeedsOscillator Type Frequency Mode Frequency C1 pF C2 pF 740 EM78P312N 809NExternal RC Oscillator Mode OS CICode Option Register Word Enwdtb = 0 Enable Enwdtb = 1 DisableCode Option Register Bit 12 ~ 9 Not usedCustomer ID Register Power-on ConsiderationsExternal Power-on Reset Circuit OSC = 0 RC type OSC = 1 Crystal typeEM78P312N Residue-Voltage ProtectionVdd EM78P809NInstruction Set Binary Instruction Hex Mnemonic Operation StatusBinary Instruction Hex Mnemonic Operation Status Affected DECRecommended Operating Conditions Symbol Parameter Condition Min Typ Max UnitAbsolute Maximum Ratings Vss =DC Electrical Characteristics Ta= 25 C, VDD= 5.0V ± 5%, VSS=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 Timing Diagram AC Test Input/Output WaveformPin Count Package Size OTP MCUPackage Type EM78P311SxY