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UARTi transmit buffer register
(b15)
b7
UARTi transmit/receive control register 0
b7
b6
b5
b4
b3
b2
(b8)
b0
b7
b1
b0
UART0 transmit/receive control register 0 (Address 34
UART1 transmit/receive control register 0 (Address 3C
Bit
0
BRG count source select bits
1
2
CTS/RTS select bit
Transmit register empty flag
3
6 to 4
Nothing is assigned.
Transfer format select bit
7
(Used in clock synchronous
serial I/O mode)
Note: Fix bit 7 to "0" in the UART mode or when Serial I/O is ignored.
7751 Group User's Manual
b0
UART0 transmit buffer register (Addresses 33
UART1 transmit buffer register (Addresses 3B
Bit
Transmit data is set.
8 to 0
15 to 9
Nothing is assigned.
Bit name
b1 b0
0 0 : f
2
0 1 : f
16
1 0 : f
64
1 1 : f
512
0 : CTS function selected.
1 : RTS function selected.
0 : Data present in transmit register.
(During transmitting)
1 : No data present in transmit register.
(Transmitting completed)
0 : LSB (Least Significant Bit) first
1 : MSB (Most Significant Bit) first
(Note)
APPENDIX
Appendix 3. Control registers
Functions
)
16
)
16
Functions
/ f
4
/ f
32
/ f
128
/ f
1024
, 32
)
16
16
, 3A
)
16
16
RW
At reset
WO
Undefined
–
Undefined
At reset
RW
0
RW
0
RW
0
RW
1
RO
–
Undefined
RW
0
20–15
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