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ADuC7060
UART Control Register 1
This 8-bit register controls the operation of the UART in
conjunction with COMCON0.
Table 89. COMSTA0 MMR Bit Designations
Bit Name Description
7 Reserved.
Name:
COMCON1
6
TEMT
COMTX and shift register empty status
bit.
Address:
Default value:
Access:
0xFFFF0710
0x00
Read and write
Set automatically if COMTX and the shift
register are empty. This bit indicates that
the data has been transmitted, that is, no
more data is present in the shift register.
Cleared automatically when writing to
Table 88. COMCON1 MMR Bit Designations
COMTX.
Bit
Name
Description
5
THRE
COMTX empty status bit.
7:5
Reserved bits. Not used.
Set automatically if COMTX is empty.
4
3:2
1
LOOPBACK
RTS
Loopback. Set by user to enable
loopback mode. In loopback mode,
the transmit pin is forced high.
Reserved bits. Not used.
Request to send.
COMTX can be written as soon as this bit
is set, the previous data might not have
been transmitted yet and can still be
present in the shift register.
Cleared automatically when writing to
COMTX.
Set by user to force the RTS output to 0.
Cleared by user to force the RTS
output to 1.
4
BI
Break indicator.
Set when P1.0/IRQ1/SIN/T0 pin is held
low for more than the maximum word
0
DTR
Data terminal ready.
Set by user to force the DTR output to 0.
length.
Cleared automatically.
Cleared by user to force the DTR
output to 1.
3
FE
Framing error.
Set when the stop bit is invalid.
Cleared automatically.
UART Status Register 0
COMSTA0 Register
Name:
COMSTA0
Address:
0xFFFF0714
Default value:
0x60
2
1
PE
OE
Parity error.
Set when a parity error occurs.
Cleared automatically.
Overrun error.
Set automatically if data are overwritten
before being read.
Cleared automatically.
Access:
Read only
0
DR
Data ready.
Set automatically when COMRX is full.
Function:
This 8-bit read-only register reflects the
current status on the UART.
Rev. 0 | Page 78 of 100
Cleared by reading COMRX.
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