7906 datasheet(166/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

8-15

TIMER B

8.4 Event counter mode

8.4.1 Count source

For timer B2 in the event counter mode, a count source (an external signal into the TB2IN pin, or fX32) can

be selected by using the timer B2 clock source select bit. (See Figure 8.4.2.) Timers B0 and B1 count the

external signals input to the TB0IN and TB1IN pins, respectively.

When fX32 is selected as the count source, the TB2IN pin serves as a programmable I/O port pin or as I/

O pins of other internal peripheral devices, which are multiplexed.

Fig. 8.4.2 Structure of particular function select register 1

(Note 2)

—

Notes 1: At power-on reset, this bit becomes “0.” At hardware reset or software reset, this bit retains the value just before reset.

2: Even when “1” is written, the bit status will not change.

3: Setting this bit to “1” must be performed just before execution of the WIT instruction. Also, after the wait state is termi-

nated, this bit must be cleared to “0” immediately.

(Note 1)

Particular function select register 1 (Address 6316)

b7 b6 b5 b4 b3 b2 b1 b0

Bit name

Bit

Function

At reset

R/W

STP-instruction-execution

status bit

WIT-instruction-execution

status bit

Fix this bit to “0.”

System clock stop select bit

at WIT

(Note 3)

Fix this bit to “0.”

The value is “0” at reading.

Timer B2 clock source select bit

(Valid in event counter mode.)

The value is “0” at reading.

0 : Normal operation.

1 : During execution of STP instruction

0 : Normal operation.

1 : During execution of WIT instruction

0 : External signal input to the TB2IN pin is counted.

1 : fX32 is counted.

0 : In the wait mode, system clock fsys is active.

1 : In the wait mode, system clock fsys is inactive.

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