Address - NEC mPD780208 Subseries User Manual

(c) Address
An address is 8-bit data which the master device outputs to the slave device connected to the bus line
in order to select a particular slave device.
SCK0
SB0 (SB1)
8-bit data following bus release and command signals is defined as an "address". In the slave device,
this condition is detected by hardware and whether or not the 8-bit data matches the slave's own
specification number (slave address) is checked by hardware. If the 8-bit data matches the slave address,
the slave device has been selected. After that, communication with the master device continues until a
release instruction is received from the master device.
228
CHAPTER 13 SERIAL INTERFACE CHANNEL 0
Figure 13-13. Address
Bus release
signal
Command signal
Figure 13-14. Slave Selection by Address
Master
Slave 2
address transmission
User's Manual U11302EJ4V0UM
1 2 3 4 5 6
A7 A6 A5 A4 A3

Address

Slave 1
Slave 2
Slave 3
Slave 4
7 8
A2 A1 A0
Not selected
Selected
Not selected
Not selected