Contents
Contents
1
2
3
General Description ...................................................................................... 1
Features ......................................................................................................... 1
Pin Assignments and Descriptions.............................................................. 2
3.1
3.2
Pin Assignments ................................................................................................. 2
Pin Descriptions ................................................................................................. 3
3.2.1
3.2.2
3.2.3
3.2.4
EM78P157NBP and EM78P157NBM Pin Descriptions ......................................3
EM78P157NAP and EM78P157NAM Pin Descriptions ......................................3
EM78P157NAAS Pin Descriptions......................................................................4
EM78P157NAKM Pin Descriptions .....................................................................4
4
Function Description..................................................................................... 5
4.1
Operational Registers......................................................................................... 5
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
Indirect Addressing (R0) Register .......................................................................6
Time Clock / Counter (R1) Register ....................................................................6
Program Counter and Stack (R2) Register .........................................................6
Status (R3) Register ............................................................................................7
RAM Select (R4) Register...................................................................................7
Port 5 ~ Port 6 (R5 ~ R6) Registers ....................................................................8
Interrupt Status (RF) Register .............................................................................8
General Purpose (R10 ~ R3F) Registers............................................................8
Accumulator (A) Register ....................................................................................8
Control (CONT ) Register....................................................................................9
I/O Port Control (IOC5 ~ IOC6) Registers...........................................................9
Prescaler Counter (IOCA ) Register....................................................................9
Pull-Down Control (IOCB) Register...................................................................10
Open-Drain Control (IOCC ) Register ...............................................................10
Pull-High Control (IOCD) Register ....................................................................11
WDT Control (IOCE) Register ...........................................................................11
IOCF (Interrupt Mask Register).........................................................................12
4.2
Special Purpose Registers ................................................................................. 8
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.3
4.4
4.5
TCC/WDT & Prescaler ..................................................................................... 12
I/O Ports ........................................................................................................... 13
4.4.1
4.5.1
4.5.2
Port 6 Input Change Wake-up/Interrupt Function Usage..................................16
Summary of Initialized Values for Registers......................................................19
The Status of RST, T, and P of STATUS Register .............................................21
4.5.2.1 RST, T and P after RESET Values .....................................................21
4.5.2.2 Event Affecting T and P Status ...........................................................21
RESET and Wake-up ....................................................................................... 17
4.6
Interrupt ............................................................................................................ 22
Product Specification (V1.0) 09.22.2005
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EMC [ ELAN MICROELECTRONICS CORP ]
