212
Chapter 7
Interrupt/Exception Processing Function
Preliminary User’s Manual U14913EE1V0UM00
7.4.5 Filter Edge Detect Mode Register (FEM0n to FEM5n) for INT0, INT1 and INT2 Input Pins
This registers are 8-bit register that control the analog or digital filter function for the INT2 to INT0 inputs
and the edge selection to the dedicated interrupt controller.
They can be read or written in 8- or 1-bit units.
Figure 7-19: INT0, INT1 and INT2 Input Pin Filter Edge Detect Mode Registers (FEM03 to FEM23)
7
6
5
4
3
2
1
0
Address
Initial
value
FEM03
DFEN
0
FSMP1
FSMP0
EDGEM1
EDGEM0
0
0
FFFFF8B0H
00H
FEM13
DFEN1
0
FSMP1
FSMP0
EDGEM1
EDGEM0
0
0
FFFFF8B1H
00H
FEM23
DFEN2
0
FSMP1
FSMP0
EDGEM1
EDGEM0
0
0
FFFFF8B2H
00H
Bit Name
Description
DFEN
Digital filter enable
Selects analog or digital filter for interrupt input.
0: Analog filter
1: Digital filter
Note:
Refer to Figure 7-16: “Port Interrupt Input Circuit Overview” on page 208
FSMP1,
FSMP0,
Filter sampling rate
Selects the sampling clock for the digital filter.
FSMP1
FSMP0
Sampling clock (clock input)
0
0
f
CPU
/ 1
0
1
f
CPU
/ 2
1
0
f
CPU
/ 4
1
1
reserved
EDGEM1,
EDGEM0
Edge selection for INTn to interrupt controller
Selects active edge for interrupt generation.
EDGEM1
EDGEM0
Sampling clock (clock input)
0
0
Internal interrupt source direct
0
1
Positive edge
1
0
Falling edge
1
1
Both edges
Remark:
n = 0 to 2
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