Contents
Contents
1
General Description.................................................................................................. 1
1.1 Comparison between EM78P159N, EM78P154N, and EM78P157N ................ 1
2
3
Features ..................................................................................................................... 1
Pin Assignments and Descriptions ......................................................................... 3
3.1 EM78P159NP and EM78P159NM Pin Description ............................................ 4
3-2 EM78P159NAS Pin Description......................................................................... 4
3.3 EM78P159NKM Pin Description ........................................................................ 5
4
Function Description ................................................................................................ 6
4.1 Operational Registers......................................................................................... 6
4.1.1 R0 (Indirect Addressing Register) .......................................................................6
4.1.2 R1 (Time Clock /Counter)....................................................................................6
4.1.3 R2 (Program Counter) & Stack ...........................................................................7
4.1.4 R3 (Status Register)............................................................................................8
4.1.5 R4 (RAM Select Register)...................................................................................9
4.1.6 R5 ~ R6 (Port 5 ~ Port 6) ....................................................................................9
4.1.7 RD (Manual Calibration Register) .......................................................................9
4.1.8 RE (Wake Up Control Register) ........................................................................10
4.1.9 RF (Interrupt Status Register) ...........................................................................10
4.1.10 R10 ~ R3F.........................................................................................................10
4.2 Special Purpose Registers ............................................................................... 11
4.2.1 A (Accumulator).................................................................................................11
4.2.2 CONT (Control Register)...................................................................................11
4.2.3 IOC5 ~ IOC6 (I/O Port Control Register) ..........................................................12
4.2.4 IOCA (Prescaler Counter Register)...................................................................12
4.2.5 IOCB (Pull-Down Control Register)...................................................................12
4.2.6 IOCC (Open-Drain Control Register) ................................................................13
4.2.7 IOCD (Pull-High Control Register) ....................................................................13
4.2.8 IOCE (WDT Control Register)...........................................................................14
4.2.9 IOCF (Interrupt Mask Register).........................................................................15
4.3 TCC/WDT & Prescaler ..................................................................................... 15
4.4 I/O Ports ........................................................................................................... 16
4.4.1 Usage of Port 6 Input Change Wake-up/Interrupt Function..............................18
4.5 RESET and Wake-up ....................................................................................... 19
4.5.1 RESET ..............................................................................................................19
4.5.2 The Summary of the Initialized Values for Registers ........................................22
4.5.3 The Status of RST, T, and P of STATUS Register.............................................24
4.6 Interrupt............................................................................................................ 25
Product Specification (V1.0) 03.10.2006
• iii
ELAN [ ELAN MICROELECTRONICS CORP ]
