T89C51RD2-3CSCM View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
T89C51RD2-3CSCM Datasheet PDF : 104 Pages
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4243G–8051–05/03
T89C51RD2
• The last bit in the register ECOM (CCAPMn.6) when set enables the comparator
function.
Table 13 shows the CCAPMn settings for the various PCA functions.
.
Table 12. CCAPMn: PCA Modules Compare/Capture Control Registers
CCAPMn
Address
n=0-4
CCAPM0=0DAH
CCAPM1=0DBH
CCAPM2=0DCH
CCAPM3=0DDH
CCAPM4=0DEH
Reset value
-
ECO
Mn
CAPP
n
CAPN
n
MATn
TOGn
PWM ECCF
m
n
X
0
0
0
0
0
0
0
Symbol
-
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMn
ECCFn
Function
Not implemented, reserved for future use. (1)
Enable Comparator. ECOMn = 1 enables the comparator function.
Capture Positive, CAPPn = 1 enables positive edge capture.
Capture Negative, CAPNn = 1 enables negative edge capture.
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.
Toggle. When TOGn = 1, a match of the PCA counter with this module’s compare/capture
register causes the CEXn pin to toggle.
Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a pulse
width modulated output.
Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register to
generate an interrupt.
1.
User software should not write 1s to reserved bits. These bits may be used in future 8051
family products to invoke new features. In that case, the reset or inactive value of the
new bit will be 0, and its active value will be 1. The value read from a reserved bit is
indeterminate.
Table 13. PCA Module Modes (CCAPMn Registers)
ECOMn CAPPn CAPNn MATn
0
0
0
0
X
1
0
0
X
0
1
0
X
1
1
0
1
0
0
1
1
0
0
1
1
0
0
0
TOGn PWMm ECCFn
Module Function
0
0
0 No Operation
0
0
X
16-bit capture by a positive-edge
trigger on CEXn
0
0
X
16-bit capture by a negative trigger
on CEXn
0
0
X
16-bit capture by a transition on
CEXn
0
0
X
16-bit Software Timer / Compare
mode.
1
0
X 16-bit High Speed Output
0
1
0 8-bit PWM
27
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