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AT83C5111 датащи(PDF) 51 Page - ATMEL Corporation

номер детали AT83C5111
подробное описание детали  Low Pin Count 8-bit Microcontroller with A/D Converter
PDF  86 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5111 датащи(HTML) 51 Page - ATMEL Corporation

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51
AT8xC5111
4190A–8051–11/02
16-bit Software Timer/
Compare Mode
The PCA modules can be used as software timers by setting both the ECOM and MAT
bits in the modules CCAPMn register. The PCA timer will be compared to the module’s
capture registers and when a match occurs an interrupt will occur if the CCFn (CCON
SFR) and the ECCFn (CCAPMn SFR) bits for the module are both set (See Figure 22).
Figure 4. PCA Compare Mode and PCA Watchdog Timer
Note:
1. Only for Module 4
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value,
otherwise an unwanted match could occur. Writing to CCAPnH will set the ECOM bit.
Once ECOM is set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t
occur while modifying the compare value. Writing to CCAPnH will set ECOM. For this
reason, user software should write CCAPnL first, and then CCAPnH. Of course, the
ECOM bit can still be controlled by accessing to CCAPMn register.
CH
CL
CCAPnH
CCAPnL
ECOMn
CCAPMn, n = 0 to 4
0xDA to 0xDE
CAPNn MATn TOGn PWMn ECCFn
CAPPn
16-bit Comparator
Match
CCON
0xD8
PCA IT
Enable
PCA Counter/Timer
RESET
(1)
CIDL
CPS1
CPS0
ECF
CMOD
0xD9
WDTE
Reset
Write to
CCAPnL
Write to
CCAPnH
CF
CCF2
CCF1
CCF0
CR
CCF3
CCF4
10



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