M16CSLASH29 datasheet(146/499 Pages) RENESAS

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12. Timer B

page 122

Figure 12.22 Operation timing when measuring a pulse width

Figure 12.21 Operation timing when measuring a pulse period

Count source

Measurement pulse

TBiS bit

TBiIC register's

IR bit

Timing at which counter

reaches 000016

“H”

Transfer

(undefined value)

“L”

TBiMR register's

MR3 bit

NOTES:

1. Counter is initialized at completion of measurement.

2. Timer has overflowed.

3. This timing diagram is for the case where bits MR1 and MR0 in the TBiMR register are 002 (measure the

interval from falling edge to falling edge of the measurement pulse).

(1)

(2)

Transfer

(measured value)

Reload register

counter

transfer timing

Bits TB0S to TB2S are assigned to the bit 5 to bit 7 in the TABSR register.

Set to 0 upon accepting an interrupt request or by program

i = 0 to 2

Measurement pulse

“H”

Count source

Timing at which counter

reaches 000016

Transfer

(measured value)

Transfer

(measured value)

“L”

(1)

Transfer

(measured

value)

(1)

Transfer

(undefined

value)

Reload register

counter

transfer timing

TBiS bit

TBiIC register's

IR bit

The MR3 bit in the

TBiMR register

NOTES:

1. Counter is initialized at completion of measurement.

2. Timer has overflowed.

3. This timing diagram is for the case where bits MR1 to MR0 in the TBiMR register are 102 (measure the interval

from a falling edge to the next rising edge and the interval from a rising edge to the next falling edge of the

measurement pulse).

Bits TB0S to TB2S are assigned to the bit 5 to bit 7 in the TABSR register.

Set to 0 upon accepting an interrupt request or by

program

i = 0 to 2

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