upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 234

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

10.4 Operation of Serial Interface UART6
10.4.1 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
234
Address: FF50H After reset: 01H R/W
Serial interface UART6 has the following two modes.
• Operation stop mode
• Asynchronous serial interface (UART) mode
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 stop the operation.
Remark To use the R
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 signal generation sets this register to 01H.
2.
To start the communication, set POWER6 to 1, and then set TXE6 or RXE6 to 1.
FUNCTIONS.
The output of the T
POWER6 = 0 during transmission.
Asynchronous serial interface reception error status register 6 (ASIS6), asynchronous serial interface
transmission status register 6 (ASIF6), and receive buffer register 6 (RXB6) are reset.
POWER6
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).
X
D6/P14 and T
TXE6
<6>
X
D6 pin goes high and the input from the R
CHAPTER 10 SERIAL INTERFACE UART6
Preliminary User’s Manual U19014EJ1V0UD
RXE6
<5>
X
D6/P13 pins as general-purpose port pins, see CHAPTER 4
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
PORT