參數(shù)資料
型號: W78ERD2
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 35/72頁
文件大?。?/td> 606K
代理商: W78ERD2
W78ERD2
Publication Release Date: April 20, 2005
- 35 -
Revision A4
9. INTERRUPT
INT2
/
INT3
Two additional external interrupts, INT2 and INT3 , whose functions are similar to those of external
interrupt 0 and 1 in the standard 80C52. The functions/status of these interrupts are
determined/shown by the bits in the XICON (External Interrupt Control) register. The XICON register is
bit-addressable but is not a standard register in the standard 80C52. Its address is at 0C0H. To
set/clear bits in the XICON register, one can use the "SETB (
CLR
) bit" instruction. For example,
"SETB 0C2H" sets the EX2 bit of XICON.
Nine-source interrupt information
INTERRUPT SOURCE
VECTOR
ADDRESS
POLLING SEQUENCE
WITHIN PRIORITY
LEVEL
ENABLE
REQUIRED
SETTINGS
INTERRUPT TYPE
EDGE/LEVEL
External Interrupt 0
03H
0 (highest)
IE.0
TCON.0
Timer/Counter 0
0BH
1
IE.1
-
External Interrupt 1
Timer/Counter 1
13H
1BH
2
3
IE.2
IE.3
TCON.2
-
Programmable
Counter Array
33H
4
IE.6
-
Serial Port
23H
5
IE.4
-
Timer/Counter 2
External Interrupt 2
2BH
33H
6
7
IE.5
-
XICON.2
XICON.0
External Interrupt 3
3BH
8 (lowest)
XICON.6
XICON.3
Four-level interrupt priority
PRIORITY BITS
IPH.X
0
IP.X
0
INTERRUPT PRIORITY LEVEL
Level 0(lowest priority)
0
1
1
0
Level 1
Level 2
1
1
Level 3(highest priority)
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