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参数资料
型号： ST7FLITE19BF0B6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP20
封装： 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-20
文件页数： 92/159页
文件大小： 2855K
代理商： ST7FLITE19BF0B6
ST7LITE1xB
38/159
INTERRUPTS (Cont’d)
EXTERNAL INTERRUPT CONTROL REGISTER
(EICR)
Read/Write
Reset Value: 0000 0000 (00h)
Bits 7:6 = IS3[1:0] ei3 sensitivity
These bits define the interrupt sensitivity for ei3
(Port B0) according to Table 6.
Bits 5:4 = IS2[1:0] ei2 sensitivity
These bits define the interrupt sensitivity for ei2
(Port B3) according to Table 6.
Bits 3:2 = IS1[1:0] ei1 sensitivity
These bits define the interrupt sensitivity for ei1
(Port A7) according to Table 6.
Bits 1:0 = IS0[1:0] ei0 sensitivity
These bits define the interrupt sensitivity for ei0
(Port A0) according to Table 6.
Notes:
1. These 8 bits can be written only when the I bit in
the CC register is set.
2. Changing the sensitivity of a particular external
interrupt clears this pending interrupt. This can be
used to clear unwanted pending interrupts. Refer
to
section
“External
Interrupt
Function”
on
page 48.
Table 6. Interrupt Sensitivity Bits
EXTERNAL INTERRUPT SELECTION REGIS-
TER (EISR)
Read/Write
Reset Value: 0000 1100 (0Ch)
Bits 7:6 = ei3[1:0] ei3 pin selection
These bits are written by software. They select the
Port B I/O pin used for the ei3 external interrupt ac-
cording to the table below.
External Interrupt I/O pin selection
Note:
1. Reset State
Bits 5:4 = ei2[1:0] ei2 pin selection
These bits are written by software. They select the
Port B I/O pin used for the ei2 external interrupt ac-
cording to the table below.
External Interrupt I/O pin selection
Notes:
1. Reset State
2. PB4 cannot be used as an external interrupt in
HALT mode.
70
IS31
IS30
IS21
IS20
IS11
IS10
IS01
IS00
ISx1 ISx0
External Interrupt Sensitivity
0
Falling edge & low level
0
1
Rising edge only
1
0
Falling edge only
1
Rising and falling edge
70
ei31
ei30
ei21
ei20
ei11
ei10
ei01
ei00
ei31
ei30
I/O Pin
0
PB0 1)
0
1
PB1
1
0
PB2
ei21
ei20
I/O Pin
0
PB3 1)
0
1
PB4 2)
1
0
PB5
1
PB6
1
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相关代理商/技术参数
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