M32C83T datasheet(292/527 Pages) RENESAS

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21. Intelligent I/O (Time Measurement Function)

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21.2 Time Measurement Function (Group 0 and 1)

When external trigger is applied, the value of the base timer is stored into the GiTMj register (i=0 to 1; j=0 to

7). Table 21.4 shows specifications of the time measurement function. Table 21.5 lists pin settings of the

time measurement function. Table 21.6 lists settings of time measurement function associated registers.

Figures 21.21 and 21.22 show operating examples of the time measurement function. Figure 21.23 shows

an operating example of the prescaler function and gate function.

Table 21.4 Time Measurement Function Specifications

Item

Specification

Measurement Channel

Group 0: Channels 0 to 7

Group 1: Channels 1, 2, 6, 7

Trigger Input Polarity

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

Measurement Start Condition

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

when the FSCj bit (i=0 to1; j=0 to 7) in the GiFS 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

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

Interrupt Request Generation Timing

The TMijR bit in the interrupt request register (See Figure 10.14) is set to "1"

(interrupt requested) at time measurement timing

INPCij Pin Function(1)

Trigger input pin

Selectable Function

• Digital filter function

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

and passes pulse signals, matching trigger input signal level, three times

• Cascaded connection function

Group 0 and group 1 are connected to operate as a 32-bit base timer

• Prescaler function (for channel 6 and channel 7)

Time measurement is executed every

GiTPRk 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

received. However, trigger input can be received again by matching the

base timer with the GiPOp register, or by setting the GSC bit in the

GiTMCRK register to "1", when the GOC bit in the GiTMCRk register is set

to "1" (gate cleared by matching the base timer with the GiPOp register

(p=4 when k=6, p=5 when k=7))

NOTES:

1. INPC00 to INPC07, INPC11 to INPC12, INPC16 to INPC17 pins (INPC00 to INPC07 pins during cascaded connection)

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