參數(shù)資料
型號: TS87C51RD2-LIE
廠商: International Rectifier
英文描述: High Performance 8-bit Microcontroller
中文描述: 高性能8位微控制器
文件頁數(shù): 31/85頁
文件大?。?/td> 762K
代理商: TS87C51RD2-LIE
31
4188E–8051–08/06
AT/TS8xC51Rx2
Figure 6-7.
PCA Compare Mode and PCA Watchdog Timer
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value, other-
wise an unwanted match could happen. Writing to CCAPnH will set the ECOM bit.
Once ECOM 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.
6.3.3
High Speed Output Mode
In this mode the CEX output (on port 1) associated with the PCA module will toggle each time a
match occurs between the PCA counter and the module's capture registers. To activate this
mode the TOG, MAT, and ECOM bits in the module's CCAPMn SFR must be set (See Figure 6-
8).
A prior write must be done to CCAPnL and CCAPnH before writing the ECOMn bit.
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 *
CIDL
CPS1
CPS0
ECF
CMOD
0xD9
WDTE
*
Only for Module 4
Reset
Write to
CCAPnL
Write to
CCAPnH
CF
CCF2
CCF1
CCF0
CR
CCF3
CCF4
1
0
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