M16CSLASH29 datasheet(181/499 Pages) RENESAS

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13. Timer S

page 157

13.4 Time Measurement Function

In synchronization with an external trigger input, the value of the base timer is stored into the G1TMj

tional timing of the time measurement function. Figure 13.21 shows operational timing of the prescaler

function and the gate function.

Table 13.5 Time Measurement Function Specifications

Item

Specification

Measurement channel

Channels 0 to 7

Selecting trigger input polarity

Rising edge, falling edge, both edges of the INPC1j pin (1)

Measurement start condition

The IFEj bit in the G1FE register should be set to 1 (channels j function

enabled) when the FSCj bit (j=0 to 7) in the G1FS register is set to 1 (time

measurement function selected).

Measurement stop condition

The IFEj bit should be set to 0 (channel j function disabled)

Time measurement timing

•No prescaler : every time a trigger signal is applied

•Prescaler (for channel 6 and channel 7):

every

G1TPRk (k=6,7) register value +1 times a trigger signal is applied

Interrupt request generation timing

The G1IRi bit (i=0 to 7) in the interrupt request register (See Figure 13.9) is

set to 1 at time measurement timing

INPC1j pin function (1)

Trigger input pin

Selectable function

• Digital filter function

The digital filter samples a trigger input signal level every f1, f2 or fBT1

cycles and passes pulse signal matching trigger input signal level three

times

• Prescaler function (for channel 6 and channel 7)

Time measurement is executed every

G1TPRk register value +1 times a

trigger signal is applied

• Gate function (for channel 6 and channel 7)

After time measurement by the first trigger input, trigger input cannot be

accepted. However, while the GOC bit in the G1TMCRk register is set to 1

(gate cleared by matching the base timer with the G1POp register (p=4

when k=6, p=5 when k=7)), trigger input can be accepted again by

matching the base timer value with the G1POp register setting

• Digital Debounce function (for channel7)

________

See 13.6.2 Digital Debounce Function for P17/INT5/INPC17 and 19.6

Digital Debounce Function

for details

NOTE:

1. The INPC10 to INPC17 pins

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