EM78P451SWM datasheet(3/54 Pages) EMC

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Contents

Product Specification (V1.0) 06.01.2004

• iii

Contents

GENERAL DESCRIPTION ................................................................................................... 1

FEATURES ........................................................................................................................... 1

PIN ASSIGNMENT ............................................................................................................... 2

FUNCTION DESCRIPTION.................................................................................................. 4

4.1

Operational Registers ..................................................................................................4

4.1.1

R0 (Indirect Address Register) ...................................................................................... 4

4.1.2

R1 (TCC) ....................................................................................................................... 4

4.1.3

R2 (Program Counter) & Stack...................................................................................... 4

4.1.4

R3 (Status Register) ......................................................................................................6

4.1.5

R4 (RAM Select Register) ............................................................................................. 6

4.1.6

R5~R8 (Port 5 ~ Port8).................................................................................................. 7

4.1.7

R9 (Port9) ...................................................................................................................... 7

4.1.8

RA (SPIRB: SPI Read Buffer)........................................................................................ 8

4.1.9

RB (SPIWB: SPI Write Buffer)....................................................................................... 8

4.1.10 RC (SPIS: SPI Status Segister)..................................................................................... 8

4.1.11 RD (SPIC: SPI Control Register)................................................................................... 9

4.1.12 RE (TMR1: Timer1 register) ........................................................................................ 10

4.1.13 RF (PWP: Pulse width preset register)........................................................................ 10

4.1.14 R20~R3E (General Purpose Register)........................................................................ 10

4.1.15 R3F (Interrupt Status Register) ................................................................................... 10

4.2

Special Purpose Registers .........................................................................................10

4.2.1

A (Accumulator) ........................................................................................................... 10

4.2.2

CONT (Control Register) ............................................................................................. 11

4.2.3

IOC5 ~ IOC9 (I/O Port Control Register)..................................................................... 11

4.2.4

IOCC (T1CON: Timer1 control register) ...................................................................... 11

4.2.5

IOCD (Pull-high Control Register) ............................................................................... 12

4.2.6

IOCE (WDT Control Register) ..................................................................................... 12

4.2.7

IOCF (Interrupt Mask Register) ................................................................................... 13

4.3

TCC/WDT Presacler ..................................................................................................14

4.4

I/O Ports .....................................................................................................................15

4.5

SERIAL PERIPHERAL INTERFACE MODE ..............................................................17

4.5.1

Overview & Features ................................................................................................... 17

4.5.2

SPI Function Description ............................................................................................. 19

4.5.3

SPI Signal & Pin Description ....................................................................................... 20

4.5.4

Programmed the related registers............................................................................... 22

4.5.5

SPI Mode Timing ......................................................................................................... 24

4.5.6

Software Application of SPI ......................................................................................... 25

4.6

Timer 1 .......................................................................................................................30

4.6.1

Overview...................................................................................................................... 30

4.6.2

Function description .................................................................................................... 30

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