Cypress FM4 Series - External Interrupt Factor Level Register (ELVR)

CHAPTER 9: External Interrupt and NMI Control Sections
448 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
4.4 External Interrupt Factor Level Register (ELVR)
The ELVR is used to select the level or edge of the signal detected as an external interrupt request.
Register configuration
bit
31
16
Field
LB15
LA15
LB14
LA14
LB13
LA13
LB12
LA12
LB11
LA11
LB10
LA10
LB9
LA9
LB8
LA8
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
LB7
LA7
LB6
LA6
LB5
LA5
LB4
LA4
LB3
LA3
LB2
LA2
LB1
LA1
LB0
LA0
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] LA15 to LA0 or LB15 to LB0: External interrupt request detection level
selection bits
LA15 to LA0 or LB15 to LB0 bits correspond to pins INT15 to INT00 on a 2-bit (LA and LB) basis.
It is not possible 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.