NEC PD78078 User Manual

Serial interface channel 1 consists of the following hardware.

Item

Configuration

Register

Serial I/O shift register 1 (SIO1)

Automatic data transmit/receive address pointer (ADTP)

Control register

Timer clock select register 3 (TCL3)

Serial operating mode register 1 (CSIM1)

Automatic data transmit/receive control register (ADTC)

Automatic data transmit/receive interval specify register (ADTI)

Port mode register 2 (PM2)

Refer to Figures 6-5 and 6-7 Block Diagram of P20, P21, P23 to 26 and Figures 6-6 and 6-

8 Block Diagram of P22 and P27.

RE

ARLD ERCE ERR

TRF STRB

BUSY

1

BUSY

0

Internal Bus

Automatic Data
Transmit/Receive
Control Register

Serial Operating
Mode Register 1

ADTI

7

ADTI

4

ADTI

3

ADTI

2

ADTI

1

ADTI

0

5-Bit Counter

Serial I/O

Shift Register 1

(SIO1)

Hand-

shake

Serial Clock

Counter

Selector

Selector

SO1/

P21

PM21

P21 Output
Latch

DIR

DIR

Buffer RAM

Automatic Data

Transmit/Receive

Address Pointer

(ADTP)

SCK1/

P22

PM22

Internal Bus

TRF

P22 Output Latch

Match

ADTI0 to ADTI4

Selector

TO2

INTCSI1

Clear

SIO1 write

Q

R

S

Selector

TCL

37

TCL

36

TCL

35

TCL

34

4

Timer Clock
Select Register 3

f

xx

/2 to f

xx

/2

8

Internal Bus

ARLD

CSIE1 DIR ATE CSIM

11

CSIM

10

ATE

SI1/
P20

STB/

P23

PM23

BUSY/

P24

Automatic Data
Transmit/Receive Interval
Specify Register