R8C2K datasheet(214/471 Pages) RENESAS

214 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 197 of 450

REJ09B0406-0110

16.3.5

Timer Mode (Output Compare Function)

This function detects when the contents of the TRC register (counter) and the TRCGRj register (j = A, B, C, or

D) match (compare match). When a match occurs a signal is output from the TRCIOj pin at a given level. The

output compare function, or other mode or function, can be selected for each individual pin.

Table 16.18 lists the Specifications of Output Compare Function, Figure 16.48 shows a Block Diagram of

Output Compare Function, Figures 16.49 to 16.51 show the registers associated with the output compare

function, Table 16.19 lists the Functions of TRCGRj Register when Using Output Compare Function, and

Figure 16.52 shows an Operating Example of Output Compare Function.

j = A, B, C, or D

Table 16.18

Specifications of Output Compare Function

Item

Specification

Count source

f1, f2, f4, f8, f32, fOCO40M, or external signal (rising edge) input to

TRCCLK pin

Count operation

Increment

Count period

• The CCLR bit in the TRCCR1 register is set to 0 (free running

operation): 1/fk × 65,536

fk: Count source frequency

• The CCLR bit in the TRCCR1 register is set to 1 (TRC register set to

0000h at TRCGRA compare match):

1/fk × (n + 1)

n: TRCGRA register setting value

Waveform output timing

Compare match

Count start condition

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

Count stop condition

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

The output compare output pin retains output level before count stops,

the TRC register retains a value before count stops.

Interrupt request generation

timing

• Compare match (contents of registers TRC and TRCGRj match)

• The TRC register overflows.

TRCIOA, TRCIOB, TRCIOC,

and TRCIOD pin functions

Programmable I/O port or output compare output (selectable individually

by pin)

INT0 pin function

Programmable I/O port, pulse output forced cutoff signal input, or INT0

interrupt input

Read from timer

The count value can be read by reading the TRC register.

Write to timer

The TRC register can be written to.

Select functions

• Output compare output pin selected

One or more of pins TRCIOA, TRCIOB, TRCIOC, and TRCIOD

• Compare match output level select

“L” output, “H” output, or toggle output

• Initial output level select

Sets output level for period from count start to compare match

• Timing for clearing the TRC register to 0000h

Overflow or compare match with the TRCGRA register

• Buffer operation (Refer to 16.3.3.2 Buffer Operation.)

• Pulse output forced cutoff signal input (Refer to 16.3.3.4 Forced Cutoff

of Pulse Output.)

• Can be used as an internal timer by disabling timer RC output

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