Port P8 Direction Register - Renesas 7700 FAMILY User Manual

SERIAL I/O
7.2 Block description

7.2.8 Port P8 direction register

I/O pins of UARTi are shared with port P8. When using pins P8
set the corresponding bits of the port P8 direction register to "0" to set these pins for the input mode. When
using pins P8 , P8 , P8
0 1
set as I/O pins of UARTi regardless of port P8 direction register's contents. Figure 7.2.13 shows the
relationship between the port P8 direction register and UARTi's I/O pins.
b7 b6 b5 b4 b3 b2
Fig. 7.2.13 Relationship between port P8 direction register and UARTi's I/O pins
7–16
to P8 and P8 as I/O pins (CTS
3 5 7
b1 b0
Port P8 direction register (Address 14
Bit Corresponding pin
0 /
CTS RTS
0
1
CLK pin
0
2
RxD pin
0
3
TxD pin
0
4 /
CTS RTS
1
5
CLK pin
1
6 RxD pin
1
7
TxD pin
1
7751 Group User's Manual
and P8
2
____ ____
/RTS , CLK
i i
)
16
pin
0 : Input mode
0
1 : Output mode
When using pins P8
serial data input pins (RxD
set the corresponding bits to "0."
pin
1
as serial data input pins (RxD
6
, TxD ) of UARTi, these pins are forcibly
i i
Functions
and P8 as
2 6
, RxD ),
0 1
),
i
RW
At reset
0
RW
0
RW
0
RW
RW
0
RW
0
RW
0
RW
0
RW
0