IBM EM78P447N manual Contents

				Contents
Contents
1	GENERAL DESCRIPTION			1
2	FEATURES		.................................................................................................................	1
3	PIN ASSIGNMENT			3
4	FUNCTION DESCRIPTION			6
	4.1	Operational Registers		7
		4.1.1	R0 (Indirect Addressing Register)	7
		4.1.2 R1 (Time Clock /Counter)		7
		4.1.3 R2 (Program Counter) & Stack		7
		4.1.4	R3 (Status Register)	10
		4.1.5 R4 (RAM Select Register)		10
		4.1.6 R5~R7 (Port 5 ~ Port7)		10
		4.1.7 R8~R1F and R20~R3E (General Purpose Register)		10
		4.1.8 R3F (Interrupt Status Register)		11
	4.2	Special Purpose Registers		11
		4.2.1	A (Accumulator)	11
		4.2.2	CONT (Control Register)	11
		4.2.3 IOC5 ~ IOC7 (I/O Port Control Register)		12
		4.2.4 IOCB (Wake-up Control Register for Port6)		12
		4.2.5 IOCE (WDT Control Register)		13
		4.2.6 IOCF (Interrupt Mask Register)		14
	4.3	TCC/WDT & Prescaler		15
	4.4	I/O Ports		16
	4.5	RESET and Wake-up		17
		4.5.1	RESET	17
		4.5.2 The Status of RST, T, and P of STATUS Register		21
	4.6	Interrupt		22
	4.7	Oscillator		23
		4.7.1	Oscillator Modes	23
		4.7.2	Crystal Oscillator/Ceramic Resonators(XTAL)	24
		4.7.3 External RC Oscillator Mode		25
	4.8	CODE Option Register		26
		4.8.1 Code Option Register (Word 0)		26
		4.8.2 Customer ID Register (Word 1)		28
	4.9	Power On Considerations		28
	4.10 External Power On Reset Circuit			28
	4.11	Residue-Voltage Protection		29
	4.12	Instruction Set		30
	4.13 Timing Diagram			33
Product Specification (V1.1) 03.30.2005				• iii