NEC uPD78P078 User Manual

Page 353

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353

CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (

µ

PD78078 SUBSERIES)

1

2

3

4

5

6

7

8

9

SCK0 Pin

C7

C6

C5

C4

C3

C2

C1

C0

ACK

BUSY

SB0 (SB1) Pin

Program Processing

Serial Transmission

INTCSI0

Generation

ACKD

Set

SCK0

Stop

Hardware Operation

ACKT

Set

Program Processing

INTCSI0

Generation

ACK

Output

Hardware Operation

CMDT

Set

Write

to SIO0

Interrupt Servicing
(Preparation for the Next Serial Transfer)

Master Device Processing (Transmitter)

Transfer Line

Slave Device Processing (Receiver)

CMDD

Set

Serial Reception

BUSY

Output

READY

Command

BUSY

Clear

BUSY

Clear

SIO0

Read

Command

analysis

Figure 17-28. Command Transmission from Master Device to Slave Device

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