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CHAPTER 14 SERIAL INTERFACE (SIO1)
Preliminary User’s Manual U13420EJ2V0UM00
14.4 Serial Interface (SIO1) Operations
The following three operating modes are available to the serial interface (SIO1).
•
Operation stop mode
•
3-wire serial I/O mode
•
3-wire serial I/O mode with automatic transmit/receive function
14.4.1 Operation stop mode
Serial transfer is not carried out in the operation stop mode. The serial I/O shift register 1 (SIO1) does not carry
out shift operation either, and thus it can be used as an ordinary 8-bit register.
In the operation stop mode, the P84/SI1, P83/SO1, P82/SCK1, P81/BUSY and P80/STB pins can be used as
ordinary input/output ports.
(1) Register setting
The operation stop mode is set with the serial operating mode register 1 (CSIM1).
CSIM1 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM1 to 00H.
Address: FF68H After reset: 00H R/W
CSIE10
Enables/disables operation of serial interface (SIO1)
Shift register operation
Serial counter
Port
Note 1
0
Stops operation
Cleared
Port function
1
Enables operation
Enables count operation
Serial fu port function
Note When CSIE10 = 0 (SIO1 operation stop status), P84/SI1, P83/SO1, P82/SCK1, P81/BUSY, and P80/
STB pins can be used as port pins.
Caution
Be sure to set bits 2 and 3 to 0.
7
CSIE10
6
DIR10
5
ATE0
4
LCSK10
3
0
2
0
1
SCL101
0
SCL100
Symbol
CSIM1
Содержание mPD780065 Series
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