7733 datasheet(223/940 Pages) RENESAS

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SERIAL I/O

7733 Group User’s Manual

8–20

8.2.9 Ports P7 and P8 direction registers

I/O pins of UARTi are multiplexed with ports P7 and P8. When using the P74, P82 and P86 pins as serial

data input pins (RxDi), set the corresponding bits of the ports P7 and P8 direction registers to “0” to set

_____

these ports for the input mode. When using the P72 pin as the CTS2 input pin, set bit 2 of the port P7

direction register to “0” to set this port for the input mode. When using the P73, P75, P80, P81, P83–P85,

_________ _________

and P87 pins as UARTi’s I/O pins (CTSi/RTSi, CLKi, TxDi), these pins are forcibly set as the UARTi’s I/O

pins, regardless of the ports P7 and P8 direction register’s contents. Also, as for CLKS0 and CLKS1, refer

to section “8.3.1 (4) Number of transfer clock output pins (UART0).” Figure 8.2.16 shows the relationship

between the ports P7, P8 direction registers and UARTi’s I/O pins.

Note that the functions of the UARTi’s I/O pins can be switched by software. For details, refer to the

description of each operating mode.

8.2 Block description

Bit

Corresponding pin name

Functions

Pin P74/AN4/RxD2

Pin P76/AN6/XCOUT

0: Input mode

1: Output mode

When using pin P72 as

the CTS2 input pin and

using pin P74 as serial

data’s input pin (RxD2),

set the corresponding

bit to “0.”

Pin P75/AN5/ADTRG/TxD2

Port P7 direction register (address 1116)

Pin P70/AN0

Pin P72/AN2/CTS2

Pin P73/AN3/CLK2

Pin P71/AN1

Pin P77/AN7/XCIN

At reset

Pin P80/CTS0/RTS0/CLKS1

Pin P82/RxD0/CLKS0

Pin P83/TxD0

Pin P84/CTS1/RTS1

Pin P86/RxD1

Pin P85/CLK1

Port P8 direction register (address 1416)

Pin P81/CLK0

Pin P87/TxD1

Not used for serial I/O

Corresponding pin name

Functions

Bit

At reset

0: Input mode

1: Output mode

When using pins P82

and P86 as serial data’s

input pins (RxD0, RxD1),

set the corresponding

bits to “0.”

Note: For pins CLKS0 and CLKS1, refer to section “8.3.1 (4) Number of transfer clock

output pins (UART0).”

Fig. 8.2.16 Relationship between ports P7, P8 direction register and UARTi’s I/O pins

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