
456
CHAPTER 16 PWC Timer
16.6.4
Pulse Width Measurement Mode Operation
The signal for pulse-width measurement is input from the PWI pin.
The pulse-width measurement mode includes the single measurement mode in which
the count is performed only once and continuous measurement mode in which the
pulse width is continuously measured.
■
Single Measurement Mode and Continuous Measurement Mode
The differences between the single measurement mode and continuous measurement mode are as follows:
●
Single measurement mode
When the first count end edge is input, the timer discontinues the count, the count end flag (EDIR) of
PWCSH0/PWCSH1 is set, and the subsequent measurement is not performed. However, if a timer restart
is also specified, the timer state changes to measurement start edge wait state.
●
Continuous measurement mode [H/L pulse-width measurement mode]
When the count end edge is input, the count end flag (EDIR) of PWCSH0/PWCSH1 is set, the timer count
result is transferred to PWC0/PWC1, and the timer may continue incrementing the count in a free-run state.
When the next count start edge is input, the timer is cleared to "0000
H
" and the pulse-width count is started.
Notes:
When the count end edge is input and the timer enters a free-run state, the timer may overflow and the
OVIR flag may be set. In the H/L pulse-width measurement mode, do not use the OVIR flag to
measure the pulse-width time.
[All edge-to-edge pulse-width measurement mode, division period measurement mode, rising edge-to-
rising edge measurement mode, and falling edge-to-falling edge measurement mode]
When the count end edge (count start edge) is input, the count end flag (EDIR) of PWCSH0/PWCSH1
is set, the timer count result is transferred to PWC0/PWC1, the timer is cleared to "0000
H
" and the
count is restarted.
■
Measurement Result Data
Handling of the measurement result, timer value, and PWC0/PWC1 function varies with the single
measurement mode and continuous measurement mode as follows:
●
Single measurement mode
When PWC0/PWC1 is read during timer operation, the current timer value is read.
When PWC0/PWC1 is read after termination of measurement, the measurement results are read.
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......