EM78P813

8-bit OTP Micro-controller

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to change without notice.

19

2004/8/19

(V1.6)

MUX

PORTD7

DAOUT

DAS

current DA

circuit

DAEN

DA9..DA0

PORTD7

VDD

Fig.12

Current DA structure

R7 Port 7 I/O Data , Data ROM address , CNT2 Data , SPI control

PAGE0 Port 7 I/O Data

7

6

5

4

3

2

1

0

P77

P76

P75

P74

P73

P72

P71

P70

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

Bit 0 ~ Bit 7 (P70 ~ P77) : 8-bit PORT7(0~7) I/O data register

User can use IOC register to define input or output each bit.

PAGE1 Data ROM address

7

6

5

4

3

2

1

0

DRA7

DRA6

DRA5

DRA4

DRA3

DRA2

DRA1

DRA0

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

R/W-X

Bit 0 ~ Bit 7 (DRA0 ~ DRA7) : Data ROM address ( 0~7 ) for ROM reading

PAGE2 Counter2 Data buffer

7

6

5

4

3

2

1

0

CN27

CN26

CN25

CN24

CN23

CN22

CN21

CN20

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

Bit 0~Bit 7(CN20~CN27) : Counter2's data buffer

User can read and write this buffer. Counter2 is a eight bit up-counter with 8-bit prescaler that user can use R7

page2 to preset and read the counter. ( write = preset)

After a interruption, it will reload the preset value.

Example: write:

MOV

0x07 , A

; write the data at accumulator to counter1 (preset)

Example: read:

MOV

A , 0x07

; read R7 data and write to accumulator

PAGE3 SPI Control Register

7

6

5

4

3

2

1

0

RBF

SPIE

SRO

SE

SCES

SBR2

SBR1

SBR0

Fig.7 shows how SPI to communicate with other device by SPI module. If SPI is a master controller, it sends clock

through the SCK pin. An 8-bit data is transmitted and received at the same time. If SPI, however, is defined as a slave,

its SCK pin could be programmed as an input pin. Data will continue to be shifted on a basis of both the clock rate and

the selected edge.