M32CSLASH8B datasheet(166/406 Pages) RENESAS

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M32C/8B Group

15. Timer A

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 149 of 385

Figure 15.9

TA0 to TA4 Registers

b15

b8 b7

Symbol

TA0 to TA2

TA3, TA4

Address

0347h - 0346h, 0349h - 0348h, 034Bh - 034Ah

034Dh - 034Ch, 034Fh - 034Eh

After Reset

Undefined

Setting Range

Mode

Function

Timer Ai Register(1) (i = 0 to 4)

0000h to FFFFh

If a count source frequency is fj and the

setting value of TAi register is n, the counter

cycle is (n + 1) / fj

Timer mode

0000h to FFFFh

If the setting value is n, the count times are

(FFFFh - n+1) when the counter increments,

and (n+1) when the counter decrements(2)

Event counter mode

0000h to FFFFh(3, 4)

If the setting value is n, the counter counts

n times and stops.

One-shot timer mode

Pulse width

modulation mode

(16-bit PWM)

Pulse width

modulation mode

(8-bit PWM)

If a count source frequency is fj and

the setting value of the TAi register is n,

PWM cycle: (216 - 1) / fj

"H" width of PWM pulse: n / fj

If a count source frequency is fj, the setting

value of high-order bits in the TAi register is

n, and the setting value of low-order bits in

the TAi register is m,

PWM cycle: (28 -1) x (m+1) / fj

"H" width of PWM pulse: (m+1) n / fj

00h to FEh(3, 6)

(High-order address bits)

00h to FFh(3, 6)

(Low-order address bits)

0000h to FFFEh(3, 5)

fj: f1, f8, f2n, fC32

NOTES:

1. Read and write this register in 16-bit units.

2. The TAi register counts external pulses or another timer overflows or underflows.

3. Read-modify-write instructions cannot be used to set the TAi register. Refer to Usage Notes for details.

4. When the TAi register is set to 0000h, the counter does not start and a timer Ai interrupt request is not generated.

5. When the TAi register is set to 0000h, the pulse width modulator does not operate and the TAiOUT pin output is held "L".

A timer Ai interrupt request is not generated. When the TAi register is set to FFFFh, the pulse width modulator does

not operate and the TAiOUT pin output is held "H". A timer Ai interrupt request is not generated.

6. When 8 high-order bits are set to 00h, the pulse width modulator does not operate and the TAiOUT pin output is held "L".

A timer Ai interrupt request is not generated. When 8 high-order bits are set to FFh, the pulse width modulator does

not operate and the TAiOUT pin output is held "H". A timer Ai interrupt request is not generated.

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