Address; Slave Selection By Address - NEC PD75402A User Manual

CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
(c) Address
An address is 8-bit data output by the master to slaves connected to the bus line in order to select a particular
slave.
SCK
SB0
Bus Release Signal
The 8-bit data following the bus release signal and command signal is defined as an address. In a slave this
condition is detected by hardware and a check is performed by hardware to see if the 8-bit data matches the
slave's own specification number (slave address). If the 8-bit data matches the slave address, that slave is
determined to have been selected and communication is subsequently performed with the master until a
disconnect directive is received from the master.
Master
Sends Address
of Slave
Fig. 5-36 Address
1 2 3
A7 A6 A5
Command Signal
Fig. 5-37 Slave Selection by Address
4 5 6 7 8
A4 A3 A2 A1 A0

Address

Slave 1
Not Selected
Selected
Slave 2
Slave 3
Not Selected
Slave 4
Selected
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