7751 Datasheet, PDF (465/540 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

APPENDIX
Appendix 3. Control registers
UARTi transmit/receive mode register
b7 b6 b5 b4 b3 b2 b1 b0
UART0 transmit/receive mode register (Address 3016)
UART1 transmit/receive mode register (Address 3816)
Bit
Bit name
0 Serial I/O mode select bits
1
2
Functions
At reset RW
b2 b1 b0
0 0 0 : Serial I/O disabled
0 RW
(P8 functions as a programmable
I/O port.)
0 0 1 : Clock synchronous serial I/O
mode
0 1 0 : Not selected
0 RW
0 1 1 : Not selected
1 0 0 : UART mode
(Transfer data length = 7 bits)
1 0 1 : UART mode
(Transfer data length = 8 bits) _{0 RW}
1 1 0 : UART mode
(Transfer data length = 9 bits)
1 1 1 : Not selected
3 Internal/External clock select bit ^{0 : Internal clock}
1 : External clock
4 ^{Stop bit length select bit}
0 : One stop bit
(Valid in UART mode) (Note) 1 : Two stop bits
0 RW
0 RW
5 Odd/Even parity select bit
0 : Odd parity
(Valid in UART mode when
1 : Even parity
parity enable bit is “1”) (Note)
0 RW
6 Parity enable bit
0 : Parity disabled
(Valid in UART mode) (Note) 1 : Parity enabled
0 RW
7 Sleep select bit
(Valid in UART mode) (Note)
0 : Sleep mode cleared (ignored)
1 : Sleep mode selected
0 RW
Note: Bits 4 to 6 are ignored in the clock synchronous serial I/O mode. (They may be either “0”
or “1.”) Additionally, fix bit 7 to “0.”
UARTi baud rate register (BRGi)
b7
b0
UART0 baud rate register (Address 3116)
UART1 baud rate register (Address 3916)
Bit
Functions
At reset _RW
7 to 0 Can be set to “0016” to “FF16.”
Undefined WO
Assuming that the set value = n, BRGi
divides the count source frequency by n + 1.
20–14
7751 Group User’s Manual