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14.3 Registers Controlling Serial Interface UART6
Serial interface UART6 is controlled by the following nine 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 mode register 1 (PM1)
• Port register 1 (P1)
(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 input sets this register to 01H.
Remark ASIM6 can be refreshed (the same value is written) by software during a communication operation
(when bit 7 (POWER6) and bit 6 (TXE6) of ASIM6 = 1 or bit 7 (POWER6) and bit 5 (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>
ASIM6
POWER6
POWER6
Note 1
0
Note 3
1
TXE6
0
1
Notes 1.
The output of the T
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.
3.
Operation of the 8-bit counter output is enabled at the second base clock after 1 is written to the
POWER6 bit.
CHAPTER 14 SERIAL INTERFACE UART6
<6>
<5>
TXE6
RXE6
Enables/disables operation of internal operation clock
Disables operation of the internal operation clock (fixes the clock to low level) and asynchronously
Note 2
resets the internal circuit
.
Enables operation of the internal operation clock
Disables transmission (synchronously resets the transmission circuit).
Enables transmission
D6 pin goes high and the input from the R
X
User's Manual U16899EJ2V0UD
4
3
PS61
PS60
CL6
Enables/disables transmission
D6 pin is fixed to the high level when
X
2
1
0
SL6
ISRM6
295
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