参数资料
型号: TS87C51RD2-VCM
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 40 MHz, MICROCONTROLLER, PDIP40
封装: PLASTIC, DIP-40
文件页数: 22/72页
文件大小: 698K
代理商: TS87C51RD2-VCM
Rev. B - Aug. 24, 1999
29
TS80C51RA2/RD2
TS83C51RB2/RC2/RD2
TS87C51RB2/RC2/RD2
6.5.2 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 10.).
Figure 10. PCA Compare Mode and PCA Watchdog Timer
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value, otherwise 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.
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
10
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