upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 308

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

14.4.2 3-wire serial I/O mode
interface.
serial input (SI10) lines.
(1) Registers used
308
The 3-wire serial I/O mode is used for connecting peripheral ICs and display controllers that have a clocked serial
In this mode, communication is executed by using three lines: the serial clock (SCK10), serial output (SO10), and
<1> Set the CSIC10 register (see Figure 14-3).
<2> Set bits 0, 4, and 6 (CSOT10, DIR10, and TRMD10) of the CSIM10 register (see Figure 14-2).
<3> Set bit 7 (CSIE10) of the CSIM10 register to 1.
<4> Write data to transmit buffer register 10 (SOTB10).
The basic procedure of setting an operation in the 3-wire serial I/O mode is as follows.
Serial operation mode register 10 (CSIM10)
Serial clock selection register 10 (CSIC10)
Port mode register 1 (PM1)
Port register 1 (P1)
Caution Take relationship with the other party of communication when setting the port mode
Read data from serial I/O shift register 10 (SIO10).
register and port register.
CHAPTER 14 SERIAL INTERFACE CSI10
User’s Manual U16961EJ4V0UD
Transmission/reception is enabled.
Data transmission/reception is started.
Data reception is started.