C8051F850-C-GM Datasheet, PDF (162/328 Pages) Silicon Laboratories – Low-Cost 8-bit MCU Family with up to 8 kB of Flash

19.1. External Interrupt Control Registers
Register 19.1. IT01CF: INT0/INT1 Configuration
Bit
7
6
5
4
3
2
1
0
Name IN1PL
IN1SL
IN0PL
IN0SL
Type
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
1
SFR Address: 0xE4
Table 19.1. IT01CF Register Bit Descriptions
Bit
Name
Function
7
IN1PL INT1 Polarity.
0: INT1 input is active low.
1: INT1 input is active high.
6:4
IN1SL INT1 Port Pin Selection Bits.
These bits select which Port pin is assigned to INT1. This pin assignment is independent
of the Crossbar; INT1 will monitor the assigned port pin without disturbing the peripheral
that has been assigned the Port pin via the Crossbar. The Crossbar will not assign the
Port pin to a peripheral if it is configured to skip the selected pin.
000: Select P0.0
001: Select P0.1
010: Select P0.2
011: Select P0.3
100: Select P0.4
101: Select P0.5
110: Select P0.6
111: Select P0.7
3
IN0PL INT0 Polarity.
0: INT0 input is active low.
1: INT0 input is active high.
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Rev. 1.0