Cypress FM4 Series - External Interrupt Factor Level Register 1 (ELVR1)

CHAPTER 9: External Interrupt and NMI Control Sections
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 449
4.5 External Interrupt Factor Level Register 1 (ELVR1)
The ELVR1 is used to select the level or edge of the signal detected as an external interrupt request.
Register configuration
bit
31
16
Field
LB31
LA31
LB30
LA30
LB29
LA29
LB28
LA28
LB27
LA27
LB26
LA26
LB25
LA25
LB24
LA24
Attribute
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
bit
15
0
Field
LB23
LA23
LB22
LA22
LB21
LA21
LB20
LA20
LB19
LA19
LB18
LA18
LB17
LA17
LB16
LA16
Attribute
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Register functions
[bit31:0] LA31 to LA16 or LB31 to LB16: External interrupt request detection level
selection bits
LA31 to LA16 or LB31 to LB16 bits correspond to pins INT31 to INT16 on a 2-bit (LA and LB) basis.
It is prohibited to set the bit corresponding to a pin that is not defined in the product specifications.
If the edge or level selected with this bit is detected, it is recognized as an external interrupt request.
LBx
LAx
Description
0
0
Detects the L level.
0
1
Detects the H level.
1
0
Detects the rising edge.
1
1
Detects the falling edge.