Maxim Integrated MAXQ Family - Manual (Page 62)

6.5.4 (Type A) External Interrupt Enable Register (EIEx)
Bit 7: Interrupt 2-5 Edge Select (IT1). This bit selects the edge detection mode for external interrupts 2-5.
0 = INT2, INT3, INT4 and INT5 are positive-edge triggered
1 = INT2, INT3, INT4 and INT5 are negative-edge triggered
Bit 6: Interrupt 0, 1 Edge Select (IT0). This bit selects the edge detection mode for external interrupts 0 and 1.
0 = INT0 and INT1 are positive-edge triggered
1 = INT0 and INT1 are negative-edge triggered
Bit 5: Enable External Interrupt 5 (EX5)
0 = external interrupt 5 function disabled
1 = external interrupt 5 function enabled
Bit 4: Enable External Interrupt 4 (EX4)
0 = external interrupt 4 function disabled
1 = external interrupt 4 function enabled
Bit 3: Enable External Interrupt 3 (EX3)
0 = external interrupt 3 function disabled
1 = external interrupt 3 function enabled
Bit 2: Enable External Interrupt 2 (EX2)
0 = external interrupt 2 function disabled
1 = external interrupt 2 function enabled
Bit 1: Enable External Interrupt 1 (EX1)
0 = external interrupt 1 function disabled
1 = external interrupt 1 function enabled
Bit 0: Enable External Interrupt 0 (EX0)
0 = external interrupt 0 function disabled
1 = external interrupt 0 function enabled
6-5
MAXQ Family User’s Guide
Bit # 7 6 5 4 3 2 1 0
Name IT1 IT0 EX5 EX4 EX3 EX2 EX1 EX0
Reset 0 0 0 0 0 0 0 0
Access rw rw rw rw rw rw rw rw
r = read, w = write
Maxim Integrated