Chapter 14 Serial Interface Csi10; Functions Of Serial Interface Csi10; Configuration Of Serial Interface Csi10 - NEC 78K0 User Manual

14.1 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 communication is not performed and can enable a reduction in the power
consumption.
For details, see 14.4.1 Operation stop mode.
(2) 3-wire serial I/O mode (MSB/LSB-first selectable)
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 is used for connecting peripheral ICs and display controllers with a clocked serial
interface.
For details, see 14.4.2 3-wire serial I/O mode.

14.2 Configuration of Serial Interface CSI10

Serial interface CSI10 includes the following hardware.
Registers
Control registers

CHAPTER 14 SERIAL INTERFACE CSI10

Table 14-1. Configuration of Serial Interface CSI10
Item
Transmit buffer register 10 (SOTB10)
Serial I/O shift register 10 (SIO10)
Transmit controller
Clock start/stop controller & clock phase controller
Serial operation mode register 10 (CSIM10)
Serial clock selection register 10 (CSIC10)
Port mode register 1 (PM1)
Port register 1 (P1)
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Configuration
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