NEC uPD78P078 User Manual
Page 337
CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (
µ
PD78078 SUBSERIES)
337
(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.
Figure 17-14. Addresses
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 8-bit data matches the 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.
Figure 17-15. Slave Selection with Address
SCK0
A7
A6
A5
A4
A3
A2
A1
A0
1
2
3
4
5
6
7
8
SB0 (SB1)
Address
Command Signal
Bus Release
Signal
Master
Slave 1
Non-Selection
Slave 2
Selection
Slave 3
Non-Selection
Slave 4
Non-Selection
Slave 2
Address Transmission