st62t18c STMicroelectronics, st62t18c Datasheet - Page 31

• Manufacturer Part Number: st62t18c
• Description: 8-bit Mcus With A/d Converter, Auto-reload Timer, Uart, Osg, Safe Reset And 20-pin Package
• Manufacturer: STMicroelectronics

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 correspondi n g
port interrupt is inverted (e.g. IPR bit 2 = A; port C
Tables 11. I/O Interrupts selections according to IPR, IOR programming
7
-
GEN
1
1
1
1
1
1
1
1
0
GEN
1
1
1
1
0
-
IPR3
0
0
0
0
1
1
1
1
X
-
-
IPR1
X
0
0
1
1
IPR0
PortD
X
0
0
1
1
0
0
1
1
-
IOR5
X
0
1
0
1
0
1
0
1
PortA PortB
IOR6
X
0
1
0
1
0
Port B occurrence
falling edge
falling edge
falling edge
falling edge
rising edge
rising edge
rising edge
rising edge
Disabled
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 .
Port A occurrence
falling edge
rising edge
high level
Disabled
low level
Port D occurrence
falling edge
falling edge
falling edge
falling edge
rising edge
rising edge
rising edge
rising edge
Disabled
ST62T18C/E18C
Interrupt
source
Interrupt
source
1
2
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