R8CSLASH2G datasheet(170/344 Pages) RENESAS

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R8C/2G Group

17. Timers

Rev.1.00

Apr 04, 2008

Page 150 of 318

REJ09B0387-0100

17.1.2

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 17.3 Pulse Output Mode

Specifications).

Figure 17.6 shows TRAIOC Register in Pulse Output Mode.

NOTE:

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

Table 17.3

Pulse Output Mode Specifications

Item

Specification

Count sources

f1, f2, f8, fOCO, fC32

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 17.1.1.1 Timer Write Control

during Count Operation

Select functions

• TRAIO output 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).

• TRAO pin select function

P3_0 or P3_7 is selected by the TRAOSEL bit in the PINSR2 register.

• Pulse output stop function

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

•INT1/TRAIO pin select function

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

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