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CHAPTER 13 SERIAL INTERFACE (UART0)
Preliminary User’s Manual U13420EJ2V0UM00
13.4 Serial Interface (UART0) Operations
This section explains the three modes of the serial interface (UART0).
13.4.1 Operation stop mode
Because serial transfer is not performed during this mode, the power consumption can be reduced.
In addition, pins can be used as ordinary ports.
(1) Register settings
Operation stop mode are set by the asynchronous serial interface mode register (ASIM0).
ASIM0 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ASIM0 to 00H.
Address: FFA0H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
ASIM0
TXE0
RXE0
PS01
PS00
CL0
SL0
ISRM0
IRDAM0
TXE0
RXE0
Operation mode
RxD0/P73 pin function
TxD0/P72 pin function
0
0
Operation stop
Port function (P73)
Port function (P72)
0
1
UART mode
Serial function (RxD0)
(receive only)
1
0
UART mode
Port function (P73)
Serial function (TxD0)
(transmit only)
1
1
UART mode
Serial function (RxD0)
(transmit and receive)
Caution
Do not switch the operation mode until the current serial transmit/receive operation has
stopped.
Содержание mPD780065 Series
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