R8CSLASH2G datasheet(212/344 Pages) RENESAS

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R8C/2G Group

17. Timers

Rev.1.00

Apr 04, 2008

Page 192 of 318

REJ09B0387-0100

Table 17.13

Output Compare Mode Specifications

Item

Specification

Count sources

f4, f8, f32, fC4

Count operations

• Increment

• When the 8-bit counter content matches with the TREMIN register

content, the value returns to 00h and count continues.

The count value is held while count stops.

Count period

• When RCS2 = 0 (4-bit counter is not used)

1/fi x 2 x (n+1)

• When RCS2 = 1 (4-bit counter is used)

1/fi x 32 x (n+1)

fi: Frequency of count source

n: Setting value of TREMIN register

Count start condition

1 (count starts) is written to the TSTART bit in the TRECR1 register

Count stop condition

0 (count stops) is written to the TSTART bit in the TRECR1 register

Interrupt request generation

timing

When the 8-bit counter content matches with the TREMIN register content

TREO pin function

Select any one of the following:

• Programmable I/O ports

• Output f2, fC, f4, or f8

• Compare output

Read from timer

When reading the TRESEC register, the 8-bit counter value can be read.

When reading the TREMIN register, the compare value can be read.

Write to timer

Writing to the TRESEC register is disabled.

When bits TSTART and TCSTF in the TRECR1 register are set to 0 (timer

stops), writing to the TREMIN register is enabled.

Selectable functions

• Select use of 4-bit counter

• Compare output function

Every time the 8-bit counter value matches the TREMIN register value,

TREO output polarity is reversed. The TREO pin outputs “L” after reset

is deasserted and the timer RE is reset by the TRERST bit in the

TRECR1 register. Output level is held by setting the TSTART bit to 0

(count stops).

• TREO pin select function

P0_4, P6_0, or P6_5 is selected by the TREOSEL bit in the PINSR3

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