upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 310

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) Communication operation
310
Caution Do not access the control register and data register when CSOT10 = 1 (during serial
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.
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 14-5. Timing in 3-Wire Serial I/O Mode (1/2)
CHAPTER 14 SERIAL INTERFACE CSI10
User’s Manual U16961EJ4V0UD
ABH
55H (communication data)
56H
ADH
5AH
B5H
6AH
D5H
AAH