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7721 Datasheet(PDF) 218 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 218 Page - Renesas Technology Corp

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SERIAL I/O
7721 Group User’s Manual
11–15
11.2 Block description
11.2.8 Port P8 direction register
I/O pins of UARTi are multiplexed with port P8. When using pins P82 and P86 as serial data input pins
(RxDi), set the corresponding bits of the port P8 direction register to “0” to set these pins for the input
____ ____
mode. When using pins P80, P81, P83 to P85 and P87 as I/O pins (CTSi/RTSi, CLKi, TxDi) of UARTi, these
pins are forcibly set as I/O pins of UARTi regardless of the port P8 direction register’s contents. Figure
11.2.13 shows the relationship between the port P8 direction register and UARTi’s I/O pins. For details,
refer to the description of each operating mode.
Fig. 11.2.13 Relationship between port P8 direction register and UARTi’s I/O pins
Bit
Corresponding pin
Functions
0
1
2
3
4
5
6
7
CTS0
/RTS0 pin
RxD0 pin
TxD0 pin
CTS1
/RTS1 pin
RxD1 pin
0 : Input mode
1 : Output mode
When using pins P82 and P86 as
serial data input pins (RxD0, RxD1),
set the corresponding bits to “0.”
CLK1 pin
Port P8 direction register (Address 1416)
b1
b0
b2
b3
b4
b5
b6
b7
CLK0 pin
TxD1 pin
At reset
RW
0
0
0
0
0
0
0
0
RW
RW
RW
RW
RW
RW
RW
RW



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