7721 datasheet(127/577 Pages) RENESAS

tên linh kiện	7721

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

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TIMER A

7721 Group User’s Manual

8–8

8.2 Block description

8.2.5 Port P5 direction register

The I/O pins of Timers A2 to A4 are multiplexed with port P5. When using these pins as Timer Aj’s input

pins, set the corresponding bits of the port P5 direction register to “0” to set these port pins for the input

mode. When used as Timer Aj’s output pins, these pins are forcibly set to the output pins of Timer Aj

regardless of the direction registers’s contents. Figure 8.2.5 shows the relationship between the port P5

direction register and the Timer Aj’s I/O pins.

Bit

Bit name

Functions

TA2OUT pin

TA3OUT pin

TA3IN pin

0 : Input mode

1 : Output mode

When using these pins as Timer Aj’

s input pins, set the corresponding

bits to “0.”

Port P5 direction register (Address D16)

TA2IN pin

At reset

: Bits 6 and 7 are not used for Timer A.

TA4OUT pin

TB0IN pin

TB1IN pin

TA4IN pin

Fig. 8.2.5 Relationship between port P5 direction register and Timer Aj’s I/O pins

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