32186 datasheet(309/1032 Pages) RENESAS

309 / 1032 page

MULTIJUNCTION TIMERS

10-13

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

10.2.3 Prescaler Unit

The Prescalers PRS0 to 2 are an 8-bit counter, which generates clocks supplied to each timer (TOP, TIO, TMS,

TML, TID and TOU) from the internal peripheral clock (BCLK) divided by 2 or 4.

The Prescalers PRS3 and 4 are an 8-bit counter, which generates clocks supplied to timerTID and TOU from the

internal peripheral clock BCLK or BCLK divided by 4.

The values of prescaler registers are initialized to H’00 upon exting the reset state. When the set value of any

prescaler register is rewritten, the prescaler starts operating with the new value at the same time it has underflowed.

Values H’00 to H’FF can be set in the prescaler register. The prescaler’s divide-by ratio is given by the equation

below:

Prescaler divide-by ratio =

prescaler set value + 1

Prescaler Register 0 (PRS0)

<Address: H’0080 0202>

Prescaler Register 1 (PRS1)

<Address: H’0080 0203>

Prescaler Register 2 (PRS2)

<Address: H’0080 0204>

Prescaler Register 3 (PRS3)

<Address: H’0080 07D0>

Prescaler Register 4 (PRS4)

<Address: H’0080 0BD0>

Bit Name

Function

0–7

PRS0–PRS4

Set the prescaler divide-by value

(8–15)

Prescaler

Prescaler Registers 0–2 start counting after exiting the reset state. Prescaler Registers 3, 4 each are activated

by setting the TID0 Control & Prescaler 3 Enable Register (TID0PRS3EN) or TID1 Control & Prescaler 4

Enable Register (TID1PRS4EN) prescaler-n enable (PRSnEN) bit to "1" (count start), upon which the prescaler

16-Bit Timer).”

If the prescaler register is accessed for read during operation, the value written into it, not the current count, is

read out.

10.2 Common Units of Multijunction Timers

3456

11121314

b15

PRS0-PRS4

000

0000

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