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CHAPTER 16 SERIAL INTERFACE (SIO31)
Preliminary User’s Manual U13420EJ2V0UM00
Notes 1. When CSIE31 = 0 (SIO31 operation stop status), the pins SI31, SO31, and SCK31 can be used for
port functions.
2. When CSIE31 = 1 (SIO31 operation enabled state), the SI31 pin can be used as a port pin if only the
send function is used, and the SO31 pin can be used as a port pin if only the receive-only mode is
used.
Remarks 1. f
X
: main system clock oscillation frequency
2. Figures in parentheses are for operation with f
X
= 8.38 MHz.
16.4 Serial Interface (SIO31) Operations
This section explains on two modes of serial interface SIO31.
16.4.1 Operation stop mode
Because the serial transfer is not performed during this mode, the power consumption can be reduced.
In addition, pins can be used as normal I/O ports.
(1) Register settings
Operation stop mode are set by the serial operation mode register 31 (CSIM31).
CSIM31 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM0 to 00H.
Address: FFB1H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CSIM31
CSIE31
0
0
0
0
MODE1
SCL311
SCL310
CSIE31
SIO31 operation enable/disable specification
Shift register operation
Serial counter
Port
0
Operation stop
Clear
Port function
Note 1
1
Operation enable
Count operation enable
Serial fu port function
Note 2
Notes 1. When CSIE31 = 0 (SIO31 operation stop status), the pins SI31, SO31, and SCK31 can be used for
port functions.
2. When CSIE31 = 1 (SIO31 operation enabled state), the SI31 pin can be used as a port pin if only the
send function is used, and the SO31 pin can be used as a port pin if only the receive-only mode is
used.
Содержание mPD780065 Series
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