EM78P152S datasheet(3/52 Pages) ETC1

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Contents

Product Specification (V1.8) 09.08.2009

• iii

Contents

General Description ...................................................................................... 1

Features ......................................................................................................... 1

Pin Assignment.............................................................................................. 2

Pin Description .............................................................................................. 3

4.1

EM78P153S ....................................................................................................... 3

4.2

EM78P152S ....................................................................................................... 4

Functional Description.................................................................................. 5

5.1

Operational Registers......................................................................................... 5

5.1.1

R0 (Indirect Addressing Register).......................................................................5

5.1.2

R1 (Timer Clock /Counter)..................................................................................5

5.1.3

R2 (Program Counter and Stack) .......................................................................6

5.1.4

R3 (Status Register) ...........................................................................................7

5.1.5

R4 (RAM Select Register) ..................................................................................8

5.1.6

R5 ~ R6 (Port 5 ~ Port 6)....................................................................................8

5.1.7

RF (Interrupt Status Register).............................................................................8

5.1.8

R10 ~ R2F ..........................................................................................................8

5.2

Special Function Registers................................................................................. 9

5.2.1

A (Accumulator) ..................................................................................................9

5.2.2

CONT (Control Register) ....................................................................................9

5.2.3

IOC5 ~ IOC6 (I/O Port Control Register)..........................................................10

5.2.4

IOCB (Pull-down Control Register)...................................................................10

5.2.5

IOCC (Open-drain Control Register) ................................................................10

5.2.6

IOCD (Pull-high Control Register) .................................................................... 11

5.2.7

IOCE (WDT Control Register) .......................................................................... 11

5.2.8

IOCF (Interrupt Mask Register) ........................................................................12

5.3

TCC/WDT and Prescaler.................................................................................. 12

5.4

I/O Ports ........................................................................................................... 13

5.5

Reset and Wake-up.......................................................................................... 16

5.5.1

Reset ................................................................................................................16

5.5.2

Summary of Registers Initialized Values ..........................................................18

5.5.3

Status of RST, T, and P of the Status Register .................................................20

5.6

Interrupt ............................................................................................................ 21

5.7

Oscillator .......................................................................................................... 22

5.7.1

Oscillator Modes ...............................................................................................22

5.7.2

Crystal Oscillator/Ceramic Resonators (Crystal) ..............................................22

5.7.3

External RC Oscillator Mode ............................................................................24

5.7.4

Internal RC Oscillator Mode .............................................................................25

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