7906 datasheet(157/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

8-6

TIMER B

8.2.5 Port P2 direction register, Port P5 direction register

The input pins of timer Bi are multiplexed with port P5 pins. By using the TB0IN/TB1IN/TB2IN pin select bit

(see Figure 8.2.5.), pin TB0IN/TB1IN/TB2IN can be allocated to the corresponding port P2 pin.

When using pins P55(P24)/TB0IN, P56(P25)/TB1IN, P57(P26)/TB2IN as timer Bi’s input pins, be sure to clear

the corresponding bits of the port direction register, which is multiplexed, to “0” in order to set these pins

to the input mode. (See Figure 8.2.6.)

8.2 Block description

Port P2 pin function control register (Address AE16)

6 to 4

Bit name

Bit

Function

At reset

R/W

Pin TB0IN select bit

Pin TB1IN select bit

Pin TB2IN select bit

Pin INT3/RTPTRG0 select bit

(Note)

Nothing is assigned.

Fix this bit to “0.”

b7 b6 b5 b4 b3 b2 b1 b0

0 : Allocate pin TB2IN to P57.

1 : Allocate pin TB2IN to P26.

0: Allocate pin INT3/RTPTRG0 to P74.

1: Allocate pin INT3/RTPTRG0 to P27.

0 : Allocate pin TB0IN to P55.

1 : Allocate pin TB0IN to P24.

0 : Allocate pin TB1IN to P56.

1 : Allocate pin TB1IN to P25.

Undefined

—

Note: When allocating pin INT3/RTPTRG0 to P74, be sure the D-A1 output enable bit (bit 1 at address 9616) = “0” (output disabled).

Fig. 8.2.5 Structure of port P2 pin function control register

7906 Datasheet(PDF) 157 Page - Renesas Technology Corp