upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 312

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

15.4.2 3-wire serial I/O mode
serial interface.
serial input (SI10) lines.
(1) Registers used
312
The 3-wire serial I/O mode can be used for connecting peripheral ICs and display controllers that have a clocked
In this mode, communication is executed by using three lines: the serial clock (SCK10), serial output (SO10), and
• Serial operation mode register 10 (CSIM10)
• Serial clock selection register 10 (CSIC10)
• Port mode register 1 (PM1)
• Port register 1 (P1)
<1> Set the CSIC10 register (see Figure 15-3).
<2> Set bits 4 and 6 (CSOT10, DIR10, and TRMD10) of the CSIM10 register (see Figure 15-2).
<3> Set bit 7 (CSIE10) of the CSIM10 register to 1. → Transmission/reception is enabled.
<4> Write data to transmit buffer register 10 (SOTB10). → Data transmission/reception is started.
The basic procedure of setting an operation in the 3-wire serial I/O mode is as follows.
Caution Take relationship with the other party of communication when setting the port mode
Read data from serial I/O shift register 10 (SIO10). → Data reception is started.
register and port register.
CHAPTER 15 SERIAL INTERFACE CSI10
User’s Manual U16962EJ3V0UD