upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 245

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

12.4 Operation of Serial Interface UART6
12.4.1 Operation stop mode
addition, the pins can be used as ordinary port pins in this mode. To set the operation stop mode, clear bits 7, 6, and
5 (POWER6, TXE6, and RXE6) of ASIM6 to 0.
(1) Register used
Address: FF50H After reset: 01H R/W
Serial interface UART6 has the following two modes.
In this mode, serial communication cannot be executed; therefore, the power consumption can be reduced. In
Notes 1.
Caution Clear POWER6 to 0 after clearing TXE6 and RXE6 to 0 to set the operation stop mode.
Remark To use the RxD6/P14 and TxD6/P13 pins as general-purpose port pins, see CHAPTER 4 PORT
Symbol
ASIM6
The operation stop mode is set by asynchronous serial interface operation mode register 6 (ASIM6).
ASIM6 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 POWER6 to 1, and then set TXE6 and RXE6 to 1.
FUNCTIONS.
POWER6
The output of the T
POWER6 = 0.
Asynchronous serial interface reception error status register 6 (ASIS6), asynchronous serial interface
transmission status register 6 (ASIF6), bit 7 (SBRF6) and bit 6 (SBRT6) of asynchronous serial
interface control register 6 (ASICL6), and receive buffer register 6 (RXB6) are reset.
POWER6
RXE6
TXE6
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 operation (synchronously resets the transmission circuit).
Disables reception (synchronously resets the reception circuit).
TXE6
<6>
X
D6 pin goes high and the input from the R
CHAPTER 12 SERIAL INTERFACE UART6
RXE6
<5>
User’s Manual U15836EJ5V0UD
Enables/disables operation of internal operation clock
Note 2
.
PS61
4
Enables/disables transmission
Enables/disables reception
PS60
3
X
CL6
D6 pin is fixed to high level when
2
SL6
1
ISRM6
0
245