Operation Of Serial Interface Uart6; Operation Stop Mode - NEC 78K0S/KA1+ Preliminary User's Manual

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11.4 Operation of Serial Interface UART6

Serial interface UART6 has the following two modes.

• Operation stop mode

• Asynchronous serial interface (UART) mode
11.4.1 Operation stop mode
In this mode, serial communication cannot be executed; therefore, the power consumption can be reduced. In
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.
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(1) Register used
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.
Address: FF90H After reset: 01H R/W
Symbol
ASIM6
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/P44 and TxD6/INTP1/P43 pins as general-purpose port pins, see CHAPTER 4 PORT
CHAPTER 11 SERIAL INTERFACE UART6
<7> <6>
POWER6 TXE6
POWER6
Note 1
0 Disable operation of the internal operation clock (fix the clock to low level) and asynchronously
reset the internal circuit
TXE6
0 Disable transmission operation (synchronously reset the transmission circuit).
RXE6
0 Disable reception (synchronously reset the reception circuit).
The output of the T D6 pin goes high and the input from the R
X
POWER6 = 0.
2. 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.
To start the operation, set POWER6 to 1, and then set TXE6 and RXE6 to 1.
FUNCTIONS.
<5> 4
RXE6 PS61 PS60
Enabling/disabling operation of internal operation clock
Note 2
.
Enabling/disabling transmission
Enabling/disabling reception
Preliminary User's Manual U16898EJ1V0UD
3 2 1
CL6 SL6
D6 pin is fixed to high level when
X
0
ISRM6
189