upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 269

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) Communication operation
In the 3-wire serial I/O mode, data is transmitted or received in 8-bit units. Each bit of the data is transmitted or
received in synchronization with the serial clock.
Data can be transmitted or received if bit 6 (TRMD10) of serial operation mode register 10 (CSIM10) is 1.
Transmission/reception is started when a value is written to transmit buffer register 10 (SOTB10). In addition,
data can be received when bit 6 (TRMD10) of serial operation mode register 10 (CSIM10) is 0.
Reception is started when data is read from serial I/O shift register 10 (SIO10).
After communication has been started, bit 0 (CSOT10) of CSIM10 is set to 1. When communication of 8-bit data
has been completed, a communication completion interrupt request flag (CSIIF10) is set, and CSOT10 is cleared
to 0. Then the next communication is enabled.
Caution Do not access the control register and data register when CSOT10 = 1 (during serial
SI10 (receive AAH)
(1) Transmission/reception timing (Type 1; TRMD10 = 1, DIR10 = 0, CKP10 = 0, DAP10 = 0)
Read/write trigger
55H is written to SOTB10.
communication).
INTCSI10
SOTB10
CSOT10
CSIIF10
SCK10
SIO10
SO10
Figure 13-5. Timing in 3-Wire Serial I/O Mode (1/2)
CHAPTER 13 SERIAL INTERFACE CSI10
User’s Manual U16846EJ3V0UD
ABH
55H (communication data)
56H
ADH
5AH
B5H
6AH
D5H
AAH
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