M16C6K9 Datasheet, PDF (96/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Timer B
When measuring a pulse time interval from falling edge to falling edge
Count source
“H”
Measurement pulse
“L”
Reload register counter
transfer timing
Timing at which counter
reaches “000016”
“1”
Count start flag
“0”
Transfer
(indeterminate value)
Transfer
(measured value)
(Note 1)
(Note 1)
(Note 2)
Timer Bi interrupt
“1”
request bit
“0”
Timer Bi overflow flag ^{“1”}
“0”
Cleared to “0” when interrupt request is accepted, or cleared by software.
Note 1: Counter is initialized at completion of measurement.
Note 2: Timer has overflowed.
Fig.FB-20 Operation timing when measuring a pulse period
Count source
“H”
Measurement pulse
“L”
Reload register counter
transfer timing
Timing at which counter
reaches “000016”
Transfer
(indeterminate
value)
Transfer
(measured value)
Transfer
(measured
value)
Transfer
(measured value)
(Note 1)
(Note 1)
(Note 1) (Note 1)
(Note 2)
Count start flag
“1”
“0”
Timer Bi interrupt
“1”
request bit
“0”
Timer Bi overflow flag ^{“1”}
“0”
Cleared to “0” when interrupt request is accepted, or cleared by software.
Note 1: Counter is initialized at completion of measurement.
Note 2: Timer has overflowed.
Fig.FB-21 Operation timing when measuring a pulse width
Rev.1.00 Jun 06, 2003 page 96 of 290