Datasheet

40
AT89C51IC2
4301D–8051–02/08
Table 28 shows the CCAPMn settings for the various PCA functions.
Table 28. 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.
6 ECOMn
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.
4 CAPNn
Capture Negative
Cleared to disable negative edge capture.
Set to enable negative edge capture.
3 MATn
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.
2 TOGn
Toggle
When TOGn = 1, a match of the PCA counter with this module's
compare/capture register causes the
CEXn pin to toggle.
1 PWMn
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.
0 CCF0
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.