7702 datasheet(110/217 Pages) RENESAS

110 / 217 page

TIMER A

7702/7703 Group User’s Manual

5–22

5.4 Event counter mode

5.4.1 Setting for event counter mode

Figures 5.4.2 and 5.4.3 show 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 “Chapter 4. INTERRUPTS.”

Fig. 5.4.2 Initial setting example for registers relevant to event counter mode (1)

V The counter divides the count source frequency by n + 1

when down-counting, or by FFFF16 – n + 1 when up-

counting.

Continue to Figure 5.4.3 on next page.

Selecting event counter mode and each function

Timer Ai mode register (i = 0 to 4)

(Addresses 5616 to 5A16)

Pulse output function select bit

0: No pulse output

1: Pulse output

Count polarity select bit

0: Counts at falling edge of external signal.

1: Counts at rising edge of external signal.

Up-down switching factor select bit

0: Contents of up-down register

1: Input signal to TAiOUT pin

! : It may be either “0” or “1.”

Selection of event counter mode

Setting divide ratio

Can be set to

“0000 16” to “FFFF16” (n).

(b15)

(b8)

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A3 register (Addresses 4D16, 4C16)

Timer A4 register (Addresses 4F16, 4E16)

Setting up–down register

Up–down register (Address 4416)

Timer A0 up–down bit

Timer A1 up–down bit

Timer A2 up–down bit

Timer A3 up–down bit

Timer A4 up–down bit

Timer A2 two–phase pulse signal processing select bit

Timer A3 two–phase pulse signal processing select bit

Timer A4 two–phase pulse signal processing select bit

Set the corresponding up–down bit when the contents of

the up-down register are selected as the up-down

sw itching factor.

Set the corresponding bit to “1” when the two–phase pulse

signal processing function is selected for timers A2 to A4.

0: Down–count

1: Up–count

0: Two–phase pulse signal processing

function disabled

1: Two–phase pulse signal processing

function enabled

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