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CHAPTER 12 16-BIT RELOAD TIMER
12.6.1
Internal Clock Mode (reload mode)
Synchronized with the internal count clock, the 16-bit reload timer is used for counting
down of the 16-bit counter, generating an interrupt request to the CPU for a counter
underflow. It can also output a toggle waveform from the timer output pin.
■
Operation in Internal Clock Mode (reload mode)
When counting is enabled (TMCSRL0/TMCSRL1:CNTE = 1) and the timer is started by the software
trigger bit (TMCSRL0/TMCSRL1:TRG) or external trigger, the value of the reload register (TMRD0/
TMRD1) is loaded into the counter, and counting starts. If the count enable bit and software trigger bit are
set to "1" simultaneously, counting starts simultaneously with the enabling of counting.
When an underflow of the counter value (from 0000
H
to FFFF
H
) occurs, the value of the 16-bit reload
register (TMRD0/TMRD1) is loaded into the counter, and counting continues. If the underflow interrupt
flag (TMCSRL0/TMCSRL1:UF) bit is set to "1" and the underflow interrupt enable (TMCSRL0/
TMCSRL1:INTE) bit is "1", an interrupt request is generated.
The timer can also output from the TO0/TO1 pin a toggle waveform, which is inverted for each underflow.
●
Software trigger operation
When "1" is written to the TRG bit of the timer control status register (TMCSRL0/TMCSRL1), the counter
is started. Figure 12.6-4 shows software trigger operation in reload mode.
Figure 12.6-4 Count Operation in Teload Mode (Software Trigger Operation)
Count clock
Counter
Data load signal
UF bit
CNTE bit
TRG bit
TO pin
Reload data
Reload data
Reload data
Reload data
T: Machine cycle
*
It takes 1T time from trigger input to loading of the reload data.
Содержание MB90460 Series
Страница 1: ...The following document contains information on Cypress products ...
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Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
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Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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