UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 498

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

17.6 SBI COMMUNICATION OPERATIONS AND VARIOUS SIGNALS
up of the following:
by either the master or a slave (normally, it is output by the 8-bit data receiver).
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This section describes the SBI serial data format and explains the meaning of the signals used.
Serial data transferred via the SBI is identified as an address, a command, or data. One frame of serial data is made
The address, command and data transfer timing is shown in Figure 17-14.
The bus release signal and command signal are output by the master. BUSY is output by a slave. ACK can be output
The serial clock is output continuously by the master from the start of an 8-bit data transfer until BUSY is released.
Address Transfer
Command Transfer
Data Transfer
SCK0
SCK0
SCK0
SB0
SB0
SB0
(Bus release signal) + (command signal) + 8-bit data + ACK + (BUSY)
Bus Release
Signal
CHAPTER 17 CLOCKED SERIAL INTERFACE
Figure 17-14 SBI Transfer Timing
Command Signal
C7
D7
A7
8
8
A0
C0
D0
ACK
ACK
9
9
9
BUSY
BUSY
ACK
BUSY
READY
READY