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User’s Manual U15798EJ2V0UD
CHAPTER 15 SERIAL INTERFACE CSI1
15.1 Functions of Serial Interface CSI1
Serial interface CSI1 has the following two modes.
• Operation stop mode
• 3-wire serial I/O mode
(1) Operation stop mode
This mode is used when serial transfer is not performed. In this mode, the power consumption can be reduced.
(2) 3-wire serial I/O mode (MSB/LSB first selectable)
This mode is used to transfer 8-bit data by using three lines: a serial clock line (SCK1) and two serial data lines
(SI1 and SO1).
The processing time of data transfer can be shortened in the 3-wire serial I/O mode because transmission and
reception can be simultaneously executed in this mode. In addition, whether 8-bit data is transferred 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 for connecting peripheral ICs and display controllers having a conventional
clocked serial interface.
15.2 Configuration of Serial Interface CSI1
Serial interface CSI1 consists of the following hardware.
Table 15-1. Configuration of Serial Interface CSI1
Item
Configuration
Registers
Transmit buffer register 1 (SOTB1)
Serial I/O shift register 1 (SIO1)
Control registers
Serial operation mode register 1 (CSIM1)
Serial clock select register 1 (CSIC1)
Содержание mPD780344 Series
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