M32CSLASH8A datasheet(163/372 Pages) RENESAS

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M32C/8A Group

15. Timers (Timer A)

Rev.1.00

Jul 15, 2007

Page 146 of 352

REJ09B0385-0100

Figure 15.6

TA0MR to TA4MR Registers in Event Counter Mode

b6 b5 b4

Symbol

TA0MR to TA4MR

Address

0356h, 0357h, 0358h, 0359h, 035Ah

After Reset

00h

Function

(When not processing

two-phase pulse signals)

Bit Symbol

Bit Name

MR3

TCK1

Count polarity select bit(2)

MR2

MR1

TCK0

Timer Ai Mode Register (i = 0 to 4)(Event Counter Mode)

TMOD1

Reserved bit

−

(b2)

b1 b0

0 1: Event counter mode(1)

Operating mode select bits

TMOD0

Set to 0

Increment/decrement

switching source select bit

NOTES:

1. Bits TAiTGH and TAiTGL in the ONSF or TRGSR register determine a count source in event counter mode.

2. The MR1 bit is enabled only when counting external signals.

3. The counter decrements when an "L" signal is applied to the TAiOUT pin. The counter increments when an "H" signal is applied

to the TAiOUT pin.

4. The TCK1 bit is enabled only in the TA3MR register. The TCK1 bit in registers TA0MR to TA2MR and TA4MR are disabled.

5. For two-phase pulse signal processing, set the TAjP bit in the UDF register (j = 2 to 4) to 1 (two-phase pulse signal processing

function enabled). Also, set bits TAjTGH and TAjTGL in the TRGSR register to 00b (input to the TAjIN pin).

Function

(When processing

two-phase pulse signals)

0: Falling edges of an

external signal counted

1: Rising edges of an

external signal counted

Set to 0

Set to 1

0: UDF registser setting

1: Signal applied to the

TAiOUT pin(3)

Count operation type

select bit

Two-phase pulse signal

processing operation

select bit(4,5)

0: Normal processing

operation

1: Multiply-by-4

processing operation

Set to 0 in event counter mode

0: Reload

1: Free running

Set to 0

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