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CHAPTER 15 SERIAL INTERFACE (SIO30)
Preliminary User’s Manual U13420EJ2V0UM00
Note When CSIE30 = 0 (SIO30 operation stop status), pins SDIO30 and SCK30 can be used as port functions.
Remarks 1. f
X
: main system clock oscillation frequency
2. Figures in parentheses are for operation with f
X
= 8.38 MHz.
15.4 Serial Interface (SIO30) Operations
This section explains the two modes of serial interface SIO30.
15.4.1 Operation stop mode
Because serial transfer is not performed in this mode, power consumption can be reduced.
In addition, pins can be used as normal I/O ports.
(1) Register settings
Operation stop mode is set by serial operation mode register 30 (CSIM30).
CSIM30 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM0 to 00H.
Address: FFB0H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CSIM30
CSIE30
0
0
0
0
MODE0
SCL301
SCL300
CSIE30
SIO30 operation enable/disable specification
Shift register operation
Serial counter
Port
0
Operation stop
Clear
Port function
Note
1
Operation enable
Count operation enable
Serial function
Note When CSIE30 = 0 (SIO30 operation stop status), pins SDIO30 and SCK30 can be used as port functions.
Содержание mPD780065 Series
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