Manual

73
AT89C5131
4136A–USB–03/03
the CAPP bit enables the positive edge. If both bits are set both edges will be
enabled and a capture will occur for either transition.
• The last bit in the register ECOM (CCAPMn.6) when set enables the comparator
function.
Table 55 shows the CCAPMn settings for the various PCA functions.
Table 54. CCAPMn Registers (n = 0-4)
CCAPM0 - PCA Module 0 Compare/Capture Control Register (0DAh)
CCAPM1 - PCA Module 1 Compare/Capture Control Register (0DBh)
CCAPM2 - PCA Module 2 Compare/Capture Control Register (0DCh)
CCAPM3 - PCA Module 3 Compare/Capture Control Register (0DDh)
CCAPM4 - PCA Module 4 Compare/Capture Control Register (0DEh)
Reset Value = X000 0000b
Not bit addressable
7 6 5 4 3 2 1 0
- ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn
Bit
Number
Bit
Mnemonic Description
7-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6ECOMn
Enable Comparator
Cleared to disable the comparator function.
Set to enable the comparator function.
5 CAPPn
Capture Positive
Cleared to disable positive edge capture.
Set to enable positive edge capture.
4CAPNn
Capture Negative
Cleared to disable negative edge capture.
Set to enable negative edge capture.
3MATn
Match
When MATn = 1, a match of the PCA counter with this module’s
compare/capture register causes the
CCFn bit in CCON to be set, flagging an interrupt.
2TOGn
Toggle
When TOGn = 1, a match of the PCA counter with this module’s
compare/capture register causes the CEXn pin to toggle.
1PWMn
Pulse Width Modulation Mode
Cleared to disable the CEXn pin to be used as a pulse width modulated output.
Set to enable the CEXn pin to be used as a pulse width modulated output.
0CCF0
Enable CCF Interrupt
Cleared to disable compare/capture flag CCFn in the CCON register to
generate an interrupt.
Set to enable compare/capture flag CCFn in the CCON register to generate an
interrupt.