Datasheet
78K0/Ix2 CHAPTER 14 SERIAL INTERFACE UART6/DALI
R01UH0010EJ0500 Rev.5.00 445
Feb 28, 2012
14.4 Operation of Serial Interface UART6/DALI
Serial interface UART6/DALI has the following three modes.
Operation stop mode
Asynchronous serial interface (UART) mode
DALI mode
14.4.1 Operation stop mode
In this mode, serial comm
unication 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.
(1) Register used
The operation stop mode is set by UART/DALI 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.
Address: FF50H After reset: 01H R/W
Symbol <7> <6> <5> 4 3 2 1 0
ASIM6 POWER6 TXE6 RXE6 PS61 PS60 CL6 SL6 ISRM6
POWER6 Enables/disables operation of internal operation clock
0
Note 1
Disables operation of the internal operation clock (fixes the clock to low level) and asynchronously
resets the internal circuit
Note 2
.
TXE6 Enables/disables transmission
0 Disables transmission operation (synchronously resets the transmission circuit).
RXE6 Enables/disables reception
0 Disables reception (synchronously resets the reception circuit).
Notes 1. The output of the T
XD6 pin is fixed to high level (when TXDLV6 = 0) and the input from the RXD6 pin is
fixed to high level when POWER6 = 0 during transmission.
2. UART/DALI reception error status register 6 (ASIS6), UART transmission status register 6 (ASIF6), bit 7
(SBRF6) and bit 6 (SBRT6) of LIN operation control register 6 (ASICL6), UART receive buffer register 6
(RXB6) and, DALI receive buffer register (RXBDL) are reset.
Caution Clear POWER6 to 0 after clearing TXE6 and RXE6 to 0 to stop the operation.
To start the communication, set POWER6 to 1, and then set TXE6 or RXE6 to 1.
Remark To use the TXD6/SCLA0/P60 and RXD6/SDAA0/P61 pins as general-purpose port pins, refer to CHAPTER 4
PORT FUNCTIONS.