参数资料
型号: AT87C5112
厂商: Atmel Corp.
英文描述: 8-bit Microcontroller with A/D Converter
中文描述: 8位微控制器与A / D转换器
文件页数: 56/97页
文件大小: 1229K
代理商: AT87C5112
56
AT8xC5112
4191B
8051
04/03
The last bit in the register ECOM (CCAPMn.6) when set enables the comparator
function.
Table 43 shows the CCAPMn settings for the various PCA functions.
Table 43.
CCAPMn: PCA Modules Compare/Capture Control Registers
CAPMn Address n = 0 - 4
7
6
5
4
3
2
1
0
-
ECOMn
CAPPn
CAPn
MATn
TOGn
PWMm
ECCFn
Bit
Number
Bit
Mnemonic
Description
7
-
Not implemented, reserved for future use.
(1)
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.
6
ECOMn
Enable Comparator. ECOMn = 1 enables the comparator function.
5
CAPPn
Capture Positive, CAPPn = 1 enables positive edge capture.
4
CAPNn
Capture Negative, CAPNn = 1 enables 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. PWMn = 1 enables the CEXn pin to be used as a
pulse width modulated output.
0
ECCFn
Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register
to generate an interrupt.
Reset value = X000000
Table 44.
PCA Module Modes (CCAPMn Registers)
ECOMn
CAPPn
CAPNn
MATn
TOGn
PWMm
ECCFn
Module Function
0
0
0
0
0
0
0
No Operation
X
1
0
0
0
0
X
16-bit capture by a positive-edge
trigger on CEXn
X
0
1
0
0
0
X
16-bit capture by a negative trigger
on CEXn
X
1
1
0
0
0
X
16-bit capture by a transition on
CEXn
1
0
0
1
0
0
X
16-bit Software Timer/Compare
mode.
1
0
0
1
1
0
X
16-bit High Speed Output
1
0
0
0
0
1
0
8-bit PWM
1
0
0
1
X
0
X
Watchdog Timer (module 4 only)
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