M32CSLASH86 datasheet(299/505 Pages) RENESAS

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Page 276

22. Intelligent I/O (Time Measurement Function)

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22.2 Time Measurement Function

When external trigger is applied, the base timer value is stored into the G1TMj register (j=0 to 7). Table 22.4

shows specifications of the time measurement function. Tables 22.5 and 22.6 list pin settings of the time

measurement function. Figures 22.13 and 22.14 show operation examples of the time measurement func-

tion. Figure 22.15 shows an operation example of the prescaler function and gate function.

Table 22.4 Time Measurement Function Specifications

Item

Specification

Measurement Channel

Channels 0 to 7

Trigger Input Polarity

Rising edge, falling edge and both edges of the INPC1j pin

Measurement Start Condition

The IFEj bit in the G1FE register is set to "1" (channel j function enabled)

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

Interrupt Request Generating Timing

The TM1jR bit in the interrupt request register (See Figure 11.14) is set to

"1" (interrupt requested) at time measurement timing

INPC1j Pin Function

Trigger input pin

Selectable Function

• Digital filter function

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

cycles and passes pulse signals, 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 or by setting the GSC

bit in the G1TMCRk register is set to "1"

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