UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 503

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

17.6.6 Busy Signal (BUSY) and Ready Signal (READY)
in synchronization with the fall of SCK0. When the busy signal is released, the master terminates output of the serial clock,
SCK0.
The busy signal is used to notify the master that the slave is preparing for data transmission/reception.
The ready signal is used to notify the master that the slave is ready to perform data transmission/reception.
With the SBI, the slave notifies the master of the busy status by driving the SB0 pin low.
The busy signal is output following an acknowledge signal output by the master or slave. The busy signal is set/released
When the busy signal is released and the ready signal state is established, the master is able to start the next transfer.
Figure 17-22 Busy Signal and Ready Signal
CHAPTER 17 CLOCKED SERIAL INTERFACE
SCK0
SB0
8
9
ACK
BUSY
READY
463