Table C-14. EXIF Register - SFR 91h
Bit
Function
EXIF.7
IE5 - External interrupt 5 flag. IE 5= 1 indicates a falling
edge was detected at the INT5# pin. IE5 must be cleared by
software. Setting IE5 in software generates an interrupt, if
enabled.
EXIF.6
EXIF.5
IE4 - External interrupt 4 flag. IE4 indicates a rising edge
was detected at the INT4 pin. IE4 must be cleared by
software. Setting IE4 in software generates an interrupt, if
enabled.
I2CINT - External interrupt 3 flag. The “INT3” interrupt is
internally connected to the EZ-USB I2C controller and
renamed “I2CINT”. I2CINT = 1 indicates an I2C interrupt.
I2CINT must be cleared by software. Setting I2CINT in
software generates an interrupt, if enabled.
EXIF.4
USBINT - External interrupt 2 flag. The “INT2” interrupt is
internally connected to the EZ-USB interrupt and renamed
“USBINT”. USBINT = 1 indicates an USB interrupt.
USBINT must be cleared by software. Setting USBINT in
software generates an interrupt, if enabled.
EXIF.3
Reserved. Read as 1.
Reserved. Read as 0.
EXIF.2-0
C - 30
Appendix C: 8051 Hardware Description
EZ-USB TRM v1.9
CYPRESS [ CYPRESS ]
