Datasheet

78K0/Ix2 CHAPTER 7 16-BIT TIMER/EVENT COUNTER 00
R01UH0010EJ0500 Rev.5.00 308
Feb 28, 2012
7.4.8 Pulse width measurement operation
TM00 can be used to measure the pulse width of the signal input to the TI000 and TI010 pins.
Measurement can be accomplished by operating the 16-bit timer/event counter 00 in the free-running timer mode or by
restarting the timer in synchronization with the signal input to the TI000 pin.
When an interrupt is generated, read the value of the valid capture register and measure the pulse width. Check bit 0
(OVF00) of 16-bit timer mode control register 00 (TMC00). If it is set (to 1), clear it to 0 by software.
Figure 7-47. Block Diagram of Pulse Width Measurement (Free-Running Timer Mode)
Timer counter
(TM00)
Capture register
(CR000)
Capture
signal
Capture signal
Interrupt signal
(INTTM010)
Interrupt signal
(INTTM000)
Capture register
(CR010)
Operable bits
TMC003, TMC002
Count clock
Edge
detection
TI000 pin
Edge
detection
TI010 pin
Selector
Figure 7-48. Block Diagram of Pulse Width Measurement
(Clear & Start Mode Entered by TI000 Pin Valid Edge Input)
Timer counter
(TM00)
Capture register
(CR000)
Capture
signal
Capture signal
Interrupt signal
(INTTM010)
Interrupt signal
(INTTM000)
Capture register
(CR010)
Operable bits
TMC003, TMC002
Count clock
Edge
detection
TI000 pin
Edge
detection
TI010 pin
Clear
Selector