7906 datasheet(258/531 Pages) RENESAS

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SERIAL I/O

7906 Group User’s Manual Rev.2.0

11-17

Fig. 11.2.13 Structure of serial I/O pin control register

(1)

CTS0/RTS0 separate select bit (bit 0)

Refer to section “11.2.10 CTS/RTS function.”

(2)

CTS1/RTS1 separate select bit (bit 1)

Refer to section “11.2.10 CTS/RTS function.”

(3)

TxD0/P13 switch bit (bit 2)

When this bit is set to “1,” the TxD0 pin functions as a programmable I/O port pin (P13). When only

reception is performed, the TxD0 pin can be used as the P13 pin. When performing transmission, be

sure to clear this bit to “0.”

(4)

TxD1/P17 switch bit (bit 3)

When this bit is set to “1,” the TxD1 pin functions as a programmable I/O port pin (P17). When only

reception is performed, the TxD1 pin can be used as the P17 pin. When preforming transmission, be

sure to clear this bit to “0.”

11.2 Block description

11.2.8 Serial I/O pin control register

Figure 11.2.13 shows the structure of the seral I/O pin control register.

Serial I/O pin control register (Address AC16)

b7 b6 b5 b4 b3 b2 b1 b0

7 to 4

CTS0/RTS0 separate select bit

(Note)

CTS1/RTS1 separate select bit

(Note)

TxD0/P13 switch bit

TxD1/P17 switch bit

The value is “0” at reading.

0 : CTS0/RTS0 are used together.

1 : CTS0/RTS0 are separated.

0 : Functions as TxD1.

1 : Functions as P17.

—

Bit name

Bit

Function

At reset

R/W

0 : CTS1/RTS1 are used together.

1 : CTS1/RTS1 are separated.

0 : Functions as TxD0.

1 : Functions as P13.

Note: Valid when the CTS/RTS enable bit (bit 4 at addresses 3416 and 3C16) is “0.”

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