NEC PD75402A - Manual (Page 107)

96
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
SCK
SB0
“H”
The bus release signal indicates that the master is about to send an address to a slave. Slaves incorporate
hardware to detect the bus release signal.
(b) Command signal (CMD)
The command signal indicates that the SB0 line has changed from high to low when the SCK line is high
(when the serial clock is not being output). This signal is output by the master.
Fig. 5-35 Command Signal
(a) Bus release signal (REL)
The bus release signal indicates that the SB0 line has changed from low to high when the SCK line is high
(when the serial clock is not being output). This signal is output by the master.
Fig. 5-34 Bus Release Signal
SCK
SB0
“H”
Slave incorporate hardware to detect the command signal.