Rainbow Electronics T89C51CC02 - Manual (Page 106)

106 Rev.A - May 17, 2001
Preliminary
T89C51CC02
16.4. 16-bit Software Timer 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.
Figure 107. PCA 16-bit Software Timer and High Speed Output Mode
CCAPnL CCAPnH
- ECOMn00MATnTOGn0ECCFn
7 0
CCAPMn Register
(n = 0, 1)
CH CL
16-Bit
Comparator
Match
Enable
CCFn
CCON reg
PCA
Interrupt
Request
CEXn
Compare/Capture Module PCA Counter
“0”
“1”
Reset
Write to
CCAPnL
Write to CCAPnH
For software Timer mode, set ECOMn and MATn.
For high speed output mode, set ECOMn, MATn and
TOGn.
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