MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 236
MC-78F0712-KIT
Manufacturer Part Number
MC-78F0712-KIT
Description
KIT REF SYSTEM 78K0 UPD78F0712
Manufacturer
Renesas Electronics America
Specifications of MC-78F0712-KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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14.4 Operation of Serial Interface UART00
14.4.1 Operation stop mode
pins can be used as ordinary port pins in this mode. To set the operation stop mode, clear bits 7, 6, and 5
(POWER00, TXE00, and RXE00) of ASIM00 to 0.
(1) Register used
234
Address: FF70H After reset: 01H R/W
ASIM00
Serial interface UART00 has the following two modes.
In this mode, serial communication cannot be executed, thus reducing the power consumption. In addition, the
Notes 1.
Caution Clear POWER00 to 0 after clearing TXE00 and RXE00 to 0 to set the operation stop mode.
Remark To use the RxD00/P13 and TxD00/P14 pins as general-purpose port pins, see CHAPTER 4 PORT
Symbol
The operation stop mode is set by asynchronous serial interface operation mode register 00 (ASIM00).
ASIM00 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets this register to 01H.
Operation stop mode
Asynchronous serial interface (UART) mode
2.
To start the operation, set POWER00 to 1, and then set TXE00 and RXE00 to 1.
FUNCTIONS.
POWER00
POWER00
The input from the RxD00 pin is fixed to high level when POWER00 = 0.
Asynchronous serial interface reception error status register 00 (ASIS00), transmit shift register 00
(TXS00), and receive buffer register 00 (RXB00) are reset.
RXE00
TXE00
0
<7>
Note 1
0
0
Disables operation of the internal operation clock (fixes the clock to low level) and asynchronously
resets the internal circuit
Disables transmission (synchronously resets the transmission circuit).
Disables reception (synchronously resets the reception circuit).
TXE00
<6>
CHAPTER 14 SERIAL INTERFACE UART00
RXE00
<5>
User’s Manual U17890EJ2V0UD
Enables/disables operation of internal operation clock
Note 2
.
PS001
4
Enables/disables transmission
Enables/disables reception
PS000
3
CL00
2
SL00
1
0
1
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