NEC PD75P402 Instrukcja Użytkownika Pobierz pdf (Strona 107)

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.

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NEC PD75P402 Instrukcja Użytkownika Strona 107