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參數(shù)資料
| 型號(hào)： | P87C754EBDDB |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 80C51 8-bit microcontroller family 4K/256 OTP/ROM, DAC, comparator, UART, reference |
| 中文描述： | 8-BIT, OTPROM, MICROCONTROLLER, PDSO28 |
| 封裝： | PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 13/26頁 |
| 文件大小： | 217K |
| 代理商： | P87C754EBDDB |
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Philips Semiconductors
Preliminary specification
83C754/87C754
80C51 8-bit microcontroller family
4K/256 OTP/ROM, DAC, comparator, UART, reference
1998 Apr 23
13
CCAPMn
Address
CCAPM
0DEH
Reset Value = X000 0000B
––
ECOM
CAPP
CAPN
MAT
TOG
PWM
ECCF
Not Bit Addressable
Bit:
Symbol
Function
–
ECOM
CAPP
CAPN
MAT
Not implemented, reserved for future use*.
Enable Comparator. ECOM = 1 enables the comparator function.
Capture Positive, CAPP = 1 enables positive edge capture.
Capture Negative, CAPN = 1 enables negative edge capture.
Match. When MAT = 1, a match of the PCA counter with this module’s compare/capture register causes the CCF bit in
CCON to be set, flagging an interrupt.
Toggle. When TOG = 1, a match of the PCA counter with this module’s compare/capture register causes the CEX pin
to toggle.
Pulse Width Modulation Mode. PWM4 = 1 enables the CEX pin to be used as a pulse width modulated output.
Enable CCF interrupt. Enables compare/capture flag CCF in the CCON register to generate an interrupt.
TOG
PWM
ECCF
NOTE:
*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.
SU00677A
7
6
5
4
3
2
1
0
Figure 10. CCAPM: PCA Modules Compare/Capture Registers
–
ECOM
CAPP
CAPN
MAT
TOG
PWM
ECCF
MODULE FUNCTION
X
0
0
0
0
0
0
0
No operation
X
X
1
0
0
0
0
X
16-bit capture by a positive-edge trigger on CEX
X
X
0
1
0
0
0
X
16-bit capture by a negative trigger on CEX
X
X
1
1
0
0
0
X
16-bit capture by a transition on CEX
X
1
0
0
1
0
0
X
16-bit Software Timer
X
1
0
0
1
1
0
X
16-bit High Speed Output
X
1
0
0
0
0
1
0
8-bit PWM
X
1
0
0
1
X
0
X
Watchdog Timer
Figure 11. PCA Module Modes (CCAPM Register)
CF
CR
CCF
––
––
CCON
(D8H)
––
ECOM
CAPP
CAPN
MAT
TOG
PWM
ECCF
CCAPM
CH
CL
CCAPH
CCAPL
CEX
CAPTURE
PCA INTERRUPT
PCA TIMER/COUNTER
0
0
0
0
(TO CCF)
SU00678A
––
––
––
Figure 12. PCA Capture Mode
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