M32CSLASH8B datasheet(160/406 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 143 of 385

15.1

Timer A

Timer A contains the following four modes. Except in event counter mode, all timers A0 to A4 have the same

functionality. Bits TMOD1 and TMOD0 in the TAiMR register (i = 0 to 4) determine which mode is used.

• Timer mode: The timer counts the internal count source.

• Event counter mode: The timer counts overflow/underflow signal of another timer or the external pulses.

• One-shot timer mode: The timer operates only once for one trigger.

• Pulse width modulation mode: The timer continuously outputs given pulse widths.

Figure 15.3 shows a block diagram of timer A. Figures 15.4 to 15.13 show the registers associated with timer A.

Table 15.1 lists TAiOUT pin settings to use in output mode. Table 15.2 lists TAiIN and TAiOUT pin settings to use

in input mode.

Figure 15.3

Timer A Block Diagram

Reload register

Clock source select

Clock select

TAiS

Polarity

Selector

High-order bits of data bus

8 low-order

bits

8 high-order

bits

Increment/decrement

TAiUD

Toggle flip flop

MR2

TMOD1 and TMOD0

Decrement

Function select register

TAiOUT

TAiIN

TAiTGH to TAiTGL

· Event counter mode

· Timer Mode (Gate Function)

· Timer mode

· One-shot timer mode

· Pulse width modulation mode

TMOD1 and TMOD0, MR2

TCK1 and TCK0

TB2 Overflow(2)

TAj Overflow(2)

TAk Overflow(2)

i = 0 to 4

j = i - 1, except j = 4 if i = 0

k = i + 1, except k = 0 if i = 4

NOTES:

1. Bits CNT3 to CNT0 in the TCSPR register select no division (n = 0) or

divide-by-2n (n = 1 to 15).

2. Overflow signal or underflow signal.

TCK1 and TCK0, TMOD1 and TMOC0, MR2 and MR1: Bits in the TAiMR register

TAiTGH to TAiTGL: Bits in the ONSF register if i = 0 or bits in the TRGSR register if i = 1 to 4

TAiS: Bit in the TABSR register

TAiUD: Bit in the UDF register

f2n(1)

fC32

Counter

Low-order bits of data bus

TAi

Addresses

TAj

TAk

Timer A0

0347h 0346h

Timer A4

Timer A1

0349h 0348h

Timer A0

Timer A2

034Bh 034Ah

Timer A1

Timer A3

034Dh 034Ch

Timer A2

Timer A4

034Fh 034Eh

Timer A3

Timer A0

Always decrement except

in event counter mode

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