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CHAPTER 17 SERIAL INTERFACE CHANNEL 0 ( PD78078 SUBSERIES)
(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.
Address Transfer
SCK0
SB0 (SB1)
Bus Release
Signal
Command Transfer
SCK0
SB0 (SB1)
Data Transfer
SCK0
SB0 (SB1)
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.
Figure 17-11. SBI Transfer Timings
A7
Address
Command Signal
C7
Command
D7
Data
8
9
A0
ACK
BUSY
9
C0 ACK
BUSY
READY
8
9
D0 ACK
BUSY
READY
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