M30218 Datasheet, PDF (87/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Timer B
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Measurement of puls time interval from falling edge to falling edge
Count source
Measurement pulse ^{“H”}
“L”
Reload register counter
transfer timing
Timing when counter
reaches “000016”
Count start
“1”
flag
“0”
Transfer
(indeterminate value)
Transfer
(measured value)
(Note 1)
(Note 1)
(Note 2)
Timer Bi interrupt
“1”
request bit
“0”
Timer Bi overflow
“1”
flag
“0”
Cleared to “0” by software, or when interrupt request is accepted.
Note 1: Counter is initialized at completion of measurement.
Note 2: Timer has overflowed.
Figure TA-7. Operation timing when measuring a pulse period
Count source
Measurement pulse
“H”
“L”
Transfer (indeterminate value) Transfer (measured value)
Reload register counter
transfer timing
Timing when counter
reaches “000016”
(Note 1) (Note 1)
(Note 1) (Note 1)
(Note 2)
Count start
“1”
flag
“0”
Timer Bi interrupt
“1”
request bit
“0”
Timer Bi overflow flag ^{“1”}
“0”
Cleared to “0” by software, or when interrupt request is accepted.
Note 1: Counter is initialized at completion of measurement.
Note 2: Timer has overflowed.
Figure TA-8. Operation timing when measuring a pulse width
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