upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 338

• Manufacturer Part Number: upd78f0134hgka1-9et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

15.4.2 3-wire serial I/O mode
interface.
serial input (SI1n) lines.
(1) Registers used
338
The 3-wire serial I/O mode is used for connecting peripheral ICs and display controllers with a clocked serial
In this mode, communication is executed by using three lines: the serial clock (SCK1n), serial output (SO1n), and
<1> Set the CSIC1n register (see Figures 15-5 and 15-6).
<2> Set bits 0 and 4 to 6 (CSOT1n, DIR1n, SSE11 (serial interface CSI11 only), and TRMD1n) of the CSIM1n
<3> Set bit 7 (CSIE1n) of the CSIM1n register to 1.
<4> Write data to transmit buffer register 1n (SOTB1n).
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 register
Remark n = 0:
Serial operation mode register 1n (CSIM1n)
Serial clock selection register 1n (CSIC1n)
Port mode register 0 (PM0) or port mode register 1 (PM1)
Port register 0 (P0) or port register 1 (P1)
register (see Figures 15-3 and 15-4).
Read data from serial I/O shift register 1n (SIO1n).
and port register.
n = 0, 1:
PD78F0132H
PD78F0133H, 78F0134H, 78F0136H, 78F0138H, 78F0138HD
CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
User’s Manual U16899EJ3V0UD
Transmission/reception is enabled.
Data transmission/reception is started.
Data reception is started.