NEC uPD78P078 User Manual
Page 335
CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (
µ
PD78078 SUBSERIES)
335
SCK0
SB0 (SB1)
SCK0
SB0 (SB1)
SCK0
SB0 (SB1)
8
9
9
A7
A0
ACK
BUSY
C7
C0
ACK
BUSY
READY
8
9
D7
D0
ACK
BUSY
READY
Address Transfer
Command Transfer
Data Transfer
Bus Release
Signal
Command Signal
Address
Data
Command
(2) SBI definition
The SBI serial data format and the signals to be used are defined as follows.
Serial data to be transferred with SBI consists of three kinds of data, “address”, “command”, and “data”.
Figure 17-11 shows the address, command, and data transfer timings.
Figure 17-11. SBI Transfer Timings
Remark
The broken lines indicate the READY state.
The bus release signal and the command signal are output by the master device. BUSY is output by the
slave signal. ACK can be output by either the master or slave device (normally, the 8-bit data receiver
outputs).
Serial clocks continue to be output by the master device from 8-bit data transfer start to BUSY reset.