M16C80 Datasheet, PDF (122/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
14. Timer B
When measuring measurement pulse time interval from falling edge to falling edge
Count source
Measurement pulse ^{“H”}
“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.
Figure 14.7 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.
Figure 14.8 Operation timing when measuring a pulse width
Rev.1.00 Aug. 02, 2005 ^{Page 111} of 329
REJ09B0187-0100