7906 datasheet(167/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

8-16

TIMER B

8.4 Event counter mode

8.4.2 Setting for event counter mode

Figure 8.4.3 shows an initial setting example for registers relevant to the event counter mode.

Note that when using interrupts, set up to enable the interrupts. For details, refer to section “CHAPTER

6. INTERRUPTS.”

Fig. 8.4.3 Initial setting example for registers relevant to event counter mode

Note: The counter divides the count source by (n + 1).

Setting division ratio

Can be set to “000016” to “FFFF16” (n).

(b15)

(b8)

Timer B0 register (Addresses 5116, 5016)

Timer B1 register (Addresses 5316, 5216)

Timer B2 register (Addresses 5516, 5416)

Count starts.

0 0 : Count at falling edge of external signal.

0 1 : Count at rising edge of external signal.

1 0 : Count at both of falling and rising edges of external signal.

1 1 : Do not selected.

Selecting event counter mode and count polarity

Timer Bi mode register (i = 0 to 2) (Addresses 5B16 to 5D16)

Setting count start bit to “1”

Count start register 0 (Address 4016)

Timer B0 count start bit

Timer B1 count start bit

Timer B2 count start bit

b3 b2

Setting interrupt priority level

Timer Bi interrupt control register (i = 0 to 2)

(Addresses 7A16 to 7C16)

Interrupt priority level select bits

When using interrupts, set these bits to one of levels 1 to 7.

When disabling interrupts, set these bits to level 0.

✕✕

✕: It may be either “0” or “1.”

Selection of event counter mode

Count polarity select bits

Selecting clock source

Particular function select register 1

(Address 6316)

Timer B2 clock source select bit

0 : Count an external signal input to the TB2IN pin

1 : Count fX32

Timers B0 and B1

Timer B2

Setting port P2 direction register

P2 direction register (Address 816)

Clear the corresponding bit to

“0.”

(Note 2)

Pin TB0IN

Pin TB1IN

Pin TB2IN

When a pin is allocated to a port P2 pin (Note 1)

Setting port P5 direction register

P5 direction register (Address D16)

Clear the corresponding bit to

“0.”

(Note 2)

Pin TB0IN

Pin TB1IN

Pin TB2IN

When a pin is allocated to a port P5 pin (Note 1)

Notes 1: By using bits 0 to 2 of the port P2 pin function control register (address AE16), be sure to set the pin allocation. (See Figure 8.2.5.)

2: When fX32 is selected as the count source in timer B2 (in other words, when bit 6 at address 6316 = 1), this setting is unnecessary.

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