UPD78F0138 NEC, UPD78F0138 Datasheet - Page 331

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

780138, and 78F0138 incorporate serial interfaces CSI10 and CSI11.
15.1 Functions of Serial Interfaces CSI10 and CSI11
(1) Operation stop mode
(2) 3-wire serial I/O mode (MSB/LSB-first selectable)
The
Serial interfaces CSI10 and CSI11 have the following two modes.
• Operation stop mode
• 3-wire serial I/O mode
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 (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 15.4.2 3-wire serial I/O mode.
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PD780131 and 780132 incorporate serial interface CSI10, and the
CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
User’s Manual U16228EJ2V0UD
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PD780133, 780134, 78F0134, 780136,
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