Chapter 15 Serial Interface Csi10; Functions Of Serial Interface Csi10; Configuration Of Serial Interface Csi10 - NEC 78K0/KD1 Series User Manual

15.1 Functions of Serial Interface CSI10

Serial interface CSI10 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 and can enable a reduction in the power consumption.
(2) 3-wire serial I/O mode (MSB/LSB-first selectable)
This mode is used to transfer 8-bit data using three lines: a serial clock line (SCK10) and two serial data lines
(SI10 and SO10).
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 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 is useful for connecting peripheral ICs and display controllers with a clocked serial
interface.

15.2 Configuration of Serial Interface CSI10

Serial interface CSI10 consists of the following hardware.
Registers
Control registers

CHAPTER 15 SERIAL INTERFACE CSI10

Table 15-1. Configuration of Serial Interface CSI10
Item
Transmit buffer register 10 (SOTB10)
Serial I/O shift register 10 (SIO10)
Serial operation mode register 10 (CSIM10)
Serial clock selection register 10 (CSIC10)
Preliminary User's Manual U16315EJ1V0UD
Configuration
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