Maxim Integrated MAXQ7667 - Manual (Page 81)

___________________________________________________________________________________________________________ 5-6
MAXQ7667 User’s Guide
5.2.3 External Interrupt Flag Register (Port 0) (EIF0)
Register Description: External Interrupt Flag Register (Port 0)
Register Name: EIF0
Register Address: Module 00h, Index 03h
Bits 15 to 8: Reserved. Read returns 0, write ignored.
Bit 7: Bit 7 Edge Detect (IE7). This bit is set when a negative edge (IT7 = 1) or a positive edge (IT7 = 0) is detected on the interrupt
7 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
Bit 6: Bit 6 Edge Detect (IE6). This bit is set when a negative edge (IT6 = 1) or a positive edge (IT6 = 0) is detected on the interrupt
6 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
Bit 5: Bit 5 Edge Detect (IE5). This bit is set when a negative edge (IT5 = 1) or a positive edge (IT5 = 0) is detected on the interrupt
5 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
Bit 4: Bit 4 Edge Detect (IE4). This bit is set when a negative edge (IT4 = 1) or a positive edge (IT4 = 0) is detected on the interrupt
4 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
Bit 3: Bit 3 Edge Detect (IE3). This bit is set when a negative edge (IT3 = 1) or a positive edge (IT3 = 0) is detected on the interrupt
3 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
Bit 2: Bit 2 Edge Detect (IE2). This bit is set when a negative edge (IT2 = 1) or a positive edge (IT2 = 0) is detected on the interrupt
2 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
Bit 1: Bit 1 Edge Detect (IE1). This bit is set when a negative edge (IT1 = 1) or a positive edge (IT1 = 0) is detected on the interrupt
1 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
Bit 0: Bit 0 Edge Detect (IE0). This bit is set when a negative edge (IT0 = 1) or a positive edge (IT0 = 0) is detected on the interrupt
0 pin. Setting this bit to 1 generates an interrupt to the CPU if enabled. This bit remains set until cleared by software or a reset. It must
be cleared by software before exiting the interrupt source routine or another interrupt will be generated as long as this bit is set.
r = read, w = write
Note: This register is cleared to 00h on all forms of reset.
Bit # 15 14 13 12 11 10 9 8
Name — — — — — — — —
Reset 0 0 0 0 0 0 0 0
Access r r r r r r r r
Bit # 7 6 5 4 3 2 1 0
Name IE7 IE6 IE5 IE4 IE3 IE2 IE1 IE0
Reset 0 0 0 0 0 0 0 0
Access rw rw rw rw rw rw rw rw