UPD78F0078GK-9ET-A Renesas Electronics America, UPD78F0078GK-9ET-A Datasheet - Page 325

• Manufacturer Part Number: UPD78F0078GK-9ET-A
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0078GK-9ET-A

• Lead Free Status / Rohs Status: Supplier Unconfirmed

17.4 Operation of Serial Interface CSI1
17.4.1 Operation stop mode
(1) Register to be used
17.4.2 3-wire serial I/O mode
serial interface.
input (SI1) lines.
(1) Registers to be used
Address: FFB0H After reset: 00H R/W
CSIM1
Symbol
The following describes the two modes of serial interface CSI1.
Serial communication is not executed in this mode, so the power consumption can be reduced.
In addition, the P20/SI1, P21/SO1, P22/SCK1, and P80/SS1 pins can be used as ordinary I/O port pins in this mode.
To set the operation stop mode, clear bit 7 (CSIE1) of CSIM1 to 0.
The 3-wire serial I/O mode can be used when connecting ICs and display controllers having a conventional clocked
In this mode, communication is executed by using three lines: serial clock (SCK1), serial output (SO1), and serial
• Serial operation mode register 1 (CSIM1)
• Serial clock select register 1 (CSIC1)
• Port mode register 2 (PM2)
• Port register 2 (P2)
The operation stop mode is set by serial operation mode register 1 (CSIM1).
CSIM1 is set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM1 to 00H.
Notes 1. When using the SI1/P20, SO1/P21, SCK1/P22, and SS1/P80 pins as general-purpose port pins, see
2. Bit 0 (CSOT1) of CSIM1 and serial I/O shift register 1 (SIO1) are reset.
Caution 2 in Figure 17-3 and Table 17-2.
CSIE1
CSIE1
0
7
Operation disabled
TRMD1
6
CHAPTER 17 SERIAL INTERFACE CSI1
SSE1
Note 1
5
User’s Manual U14260EJ4V0UD
and internal circuit is asynchronously reset
Control of operation in 3-wire serial I/O mode
DIR1
4
3
0
2
0
Note 2
.
1
0
CSOT1
0
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