EM78P451WM datasheet(3/54 Pages) EMC

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Contents

Product Specification (V1.1) 06.30.2003

• 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)..................................................................................................6

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) ..........................................................................................9

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) .............................................................................................10

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 .......................................................................................................................29

4.6.1

Overview......................................................................................................................29

4.6.2

Function Description....................................................................................................30

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