参数资料
型号: ST62T18CB6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP20
封装: 0.300 INCH, PLASTIC, DIP-20
文件页数: 25/82页
文件大小: 937K
代理商: ST62T18CB6
Obsolete
Product(s)
- Obsolete
Product(s)
31/82
ST62T18C/E18C
INTERRUPTS (Cont’d)
Interrupt Polarity Register (IPR)
Address: DAh
Read/Write
In conjunction with I/O register ESB bit, the polarity
of I/O pins triggered interrupts can be selected by
setting accordingly the Interrupt Polarity Register
(IPR). If a bit in IPR is set to one the corresponding
port interrupt is inverted (e.g. IPR bit 2 = A; port C
generates interrupt on rising edge. At reset, IPR is
cleared and all port interrupts are not inverted (e.g.
Port C generates interrupts on falling edges).
Bit 7 - Bit 4 =
Unused.
Bit 3 =
Port D Interrupt Polarity.
Bit 2 = Unused.
Bit 1=
Port A Interrupt Polarity.
Bit 0 =
Port B Interrupt Polarity.
Tables 11. I/O Interrupts selections according to IPR, IOR programming
70
-
PortD
-
PortA PortB
GEN
IPR3
IPR0
IOR5
Port B occurrence
Port D occurrence
Interrupt
source
1
0
falling edge
2
1
0
1
rising edge
1
0
1
0
rising edge
falling edge
1
0
1
falling edge
rising edge
1
0
falling edge
rising edge
1
0
1
rising edge
falling edge
1
0
rising edge
1
falling edge
0
X
Disabled
GEN
IPR1
IOR6
Port A occurrence
Interrupt
source
1
0
falling edge
1
0
1
low level
1
0
rising edge
1
high level
0
X
Disabled
31
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