upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 306

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

15.1 Functions of Serial Interface CSI10
(1) Operation stop mode
(2) 3-wire serial I/O mode (MSB/LSB-first selectable)
15.2 Configuration of Serial Interface CSI10
306
Serial interface CSI10 has the following two modes.
• Operation stop mode
• 3-wire serial I/O mode
Serial interface CSI10 includes the following hardware.
This mode is used when serial communication is not performed and can enable a reduction in the power
consumption.
For details, see 15.4.1 Operation stop mode.
This mode is used to communicate 8-bit data using three lines: a serial clock line (SCK10) and two serial data
lines (SI10 and SO10).
The processing time of data communication can be shortened in the 3-wire serial I/O mode because transmission
and reception can be simultaneously executed.
In addition, whether 8-bit data is communicated with the MSB or LSB first can be specified, so this interface can
be connected to any device.
The 3-wire serial I/O mode can be used connecting peripheral ICs and display controllers with a clocked serial
interface.
For details, see 15.4.2 3-wire serial I/O mode.
Registers
Control registers
Item
Table 15-1. Configuration of Serial Interface CSI10
CHAPTER 15 SERIAL INTERFACE CSI10
Transmit buffer register 10 (SOTB10)
Serial I/O shift register 10 (SIO10)
Serial operation mode register 10 (CSIM10)
Serial clock selection register 10 (CSIC10)
Port mode register 1 (PM1)
Port register 1 (P1)
User’s Manual U16962EJ3V0UD
Configuration