NEC PD75P402 Manuale Utente Pagina 130

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119
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
V
DD
SB0 (SB1)
SCK
SB0 (SB1)
SCK
SB0 
SCK
SB0 (SB1)
SCK
(12) SBI mode application
This section presents examples of applications in which serial data communication is performed in SBI mode.
In these application examples, the
µ
PD75402A is operated as a slave CPU on the serial bus.
Also, the master can be changed by a command.
(a) Serial bus configuration
In the serial bus configuration in the application examples given here, the
µ
PD75402A is connected to the
bus line as one of the devices on the serial bus.
The
µ
PD75402A uses two pins: The serial data bus SB0 (P02/SO), and the serial clock SCK (P01).
An example of the serial bus configuration is shown in Fig. 5-53. Only addresses C0H through C7H can be
allocated to the
µ
PD75402A.
Fig. 5-53 Example of Serial Bus Configuration
Master CPU
µ
PD75308
Slave CPU
µ
PD75328
Address C0H
Address 1
Address N
Slave IC
Slave CPU
µ
PD75402A
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