R27 datasheet(167/487 Pages) RENESAS

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R8C/26 Group, R8C/27 Group

14. Timers

Rev.2.10

Sep 26, 2008

Page 148 of 453

REJ09B0278-0210

14.1.2

Pulse Output Mode

In pulse output mode, the internally generated count source is counted, and a pulse with inverted polarity is

output from the TRAIO pin each time the timer underflows (refer to Table 14.3 Specifications of Pulse

Output Mode).

Figure 14.6 shows the TRAIOC Register in Pulse Output Mode.

NOTES:

1. The level of the output pulse becomes the level when the pulse output starts when the TRAMR

2. For J, K version, fC32 cannot be selected.

Table 14.3

Specifications of Pulse Output Mode

Item

Specification

Count sources

f1, f2, f8, fOCO, fC32(2)

Count operations

• Decrement

• When the timer underflows, the contents in the reload register is reloaded

and the count is continued.

Divide ratio

1/(n+1)(m+1)

n: Value set in TRAPRE register, m: Value set in TRA register

Count start condition

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

Count stop conditions

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

• 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register.

Interrupt request

generation timing

When timer RA underflows [timer RA interrupt].

INT1/TRAIO pin function Pulse output, programmable output port, or INT1 interrupt(1)

TRAO pin function

Programmable I/O port or inverted output of TRAIO(1)

Read from timer

The count value can be read by reading registers TRA and TRAPRE.

Write to timer

• When registers TRAPRE and TRA are written while the count is stopped,

values are written to both the reload register and counter.

• When registers TRAPRE and TRA are written during the count, values are

written to the reload register and counter (refer to 14.1.1.1 Timer Write

Control during Count Operation).

Select functions

• TRAIO signal polarity switch function

The TEDGSEL bit in the TRAIOC register selects the level at the start of

pulse output.(1)

• TRAO output function

Pulses inverted from the TRAIO output polarity can be output from the TRAO

pin (selectable by the TOENA bit in the TRAIOC register).

• Pulse output stop function

Output from the TRAIO pin is stopped by the TOPCR bit in the TRAIOC

•INT1/TRAIO pin select function

P1_7 or P1_5 is selected by the TIOSEL bit in the TRAIOC register.

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