C8051F521-C-IM View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
MFG CO.
C8051F521-C-IM Datasheet PDF : 221 Pages
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C8051F52x/F53x
SFR Definition 10.5. IT01CF: INT0/INT1 Configuration
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
IN1PL IN1SL2 IN1SL1 IN1SL0 IN0PL IN0SL2 IN0SL1 IN0SL0 00000001
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address: 0xE4
Note: Refer to SFR Definition 18.1. “TCON: Timer Control” on page 186 for INT0/1 edge- or level-sensitive interrupt selection.
Bit 7: IN1PL: INT0 Polarity
0: INT0 input is active low.
1: INT0 input is active high.
Bits 6–4: IN1SL2–0: INT0 Port Pin Selection Bits
These bits select which Port pin is assigned to INT0. Note that this pin assignment is inde-
pendent of the Crossbar; INT0 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 (accomplished by
setting to 1 the corresponding bit in register P0SKIP).
IN1SL2-0
INT1 Port Pin
000
P0.0
001
P0.1
010
P0.2
011
P0.3
100
P0.4
101
P0.5
110
P0.6*
111
P0.7*
Note: Available in the C80151F53x/C8051F53xA parts.
Bit 3: IN0PL: INT0 Polarity
0: INT0 interrupt is active low.
1: INT0 interrupt is active high.
Bits 2–0: INT0SL2–0: INT0 Port Pin Selection Bits
These bits select which Port pin is assigned to INT0. Note that this pin assignment is inde-
pendent of the Crossbar. INT0 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 (accomplished by
setting to 1 the corresponding bit in register P0SKIP).
IN0SL2-0
INT0 Port Pin
000
P0.0
001
P0.1
010
P0.2
011
P0.3
100
P0.4
101
P0.5
110
P0.6*
111
P0.7*
Note: Available in the C80151F53x/C8051F53xA parts.
Rev. 1.4
105
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