Datasheet

CHAPTER 14 SERIAL INTERFACE UART6
User’s Manual U18698EJ1V0UD
342
14.3 Registers Controlling Serial Interface UART6
Serial interface UART6 is controlled by the following twelve registers.
• Asynchronous serial interface operation mode register 6 (ASIM6)
• Asynchronous serial interface reception error status register 6 (ASIS6)
• Asynchronous serial interface transmission status register 6 (ASIF6)
• Clock selection register 6 (CKSR6)
• Baud rate generator control register 6 (BRGC6)
• Asynchronous serial interface control register 6 (ASICL6)
• Input switch control register (ISC)
• Port function register 1 (PF1)
• Port mode register 1 (PM1)
• Port register 1 (P1)
• Port mode register 11 (PM11)
• Port register 11 (P11)
(1) Asynchronous serial interface operation mode register 6 (ASIM6)
This 8-bit register controls the serial communication operations of serial interface UART6.
This register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to 01H.
Remark ASIM6 can be refreshed (the same value is written) by software during a communication operation
(when bits 7 and 6 (POWER6, TXE6) of ASIM6 = 1 or bits 7 and 5 (POWER6, RXE6) of ASIM6 = 1).
Figure 14-5. Format of Asynchronous Serial Interface Operation Mode Register 6 (ASIM6) (1/2)
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
.
1 Enables operation of the internal operation clock
TXE6 Enables/disables transmission
0 Disables transmission (synchronously resets the transmission circuit).
1 Enables transmission
RXE6 Enables/disables reception
0 Disables reception (synchronously resets the reception circuit).
1 Enables reception
Notes 1. The output of the T
XD6 pin goes high level and the input from the RXD6 pin is fixed to the high level
when POWER6 = 0 during transmission.
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.