upd75238 Renesas Electronics Corporation., upd75238 Datasheet - Page 101
upd75238
Manufacturer Part Number
upd75238
Description
4 Bit Single-chip Microcomputer
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD75238.pdf
(190 pages)
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PD75238
(ii)
Communication operation
In the SBI mode, the master usually selects a slave device to communicate with from multiple
devices by outputting the address of the slave in the serial bus.
After selecting a device to communicate with, the master exchanges commands and data with
the slave device, thus establishing serial communication.
Fig. 4-54 to 4-57 show the timing charts of data communication operations.
In the SBI mode, the shift register 0 performs shift operation on the falling edge of the serial clock
(SCK0). Send data is held on the SO0 latch, and is output on the SB0/P02 or SB1/P03 pin starting
with the MSB. Receive data applied to the SB0 (or SB1) pin is latched in the shift register 0 on
the rising edge of SCK0.
101
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