Chapter 16 Serial Interfaces Csi10 And Csi11; Functions Of Serial Interfaces Csi10 And Csi11 - NEC 78K0 User Manual

CHAPTER 16 SERIAL INTERFACES CSI10 AND CSI11

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The PD780143 and 780144 incorporate serial interface CSI10, and the
incorporate serial interfaces CSI10 and CSI11.

16.1 Functions of Serial Interfaces CSI10 and CSI11

Serial interfaces CSI10 and CSI11 have 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 16.4.1 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 (SCK1n) and two serial data
lines (SI1n and SO1n).
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 16.4.2 3-wire serial I/O mode.
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User's Manual U15947EJ2V0UD
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PD780146, 780148, and 78F0148