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AT80C51RB2-3CSIM bảng dữ liệu(PDF) 25 Page - ATMEL Corporation

tên linh kiện AT80C51RB2-3CSIM
Giải thích chi tiết về linh kiện  80C51 High Performance ROM 8-bit Microcontroller
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nhà sản xuất  ATMEL [ATMEL Corporation]
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AT80C51RB2-3CSIM bảng dữ liệu(HTML) 25 Page - ATMEL Corporation

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AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
Table 12. CCON Register
CCON - PCA Counter Control Register (D8h)
Reset Value = 000X 0000b
Not bit addressable
The watchdog timer function is implemented in module 4 (see Figure 11).
The PCA interrupt system is shown in Figure 9.
765
43210
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
Bit
Number
Bit
Mnemonic
Description
7CF
PCA Counter Overflow flag
Set by hardware when the counter rolls over. CF flags an interrupt if bit ECF in
CMOD is set. CF may be set by either hardware or software but can only be
cleared by software.
6CR
PCA Counter Run control bit
Must be cleared by software to turn the PCA counter off.
Set by software to turn the PCA counter on.
5-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
CCF4
PCA Module 4 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
3
CCF3
PCA Module 3 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
2
CCF2
PCA Module 2 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
1
CCF1
PCA Module 1 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.
0
CCF0
PCA Module 0 interrupt flag
Must be cleared by software.
Set by hardware when a match or capture occurs.



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