Samsung S3F401F - Manual (Page 186)

S3F401F_UM_REV1.00 I/O PORTS
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External Interrupt Filter Control Register (Continued) EXTINTF0 (0x058) Access: Read/Write
EXTINTF1EN External Interrupt Filter Selection Bit
0 = Disable
1 = Enable
EXTINT2SEL External Interrupt with Filter Selection Field
00000 = INT0 01000 = INT8 10000 = INT16 11000 = INT24
00001 = INT1 01001 = INT9 10001 = INT17 11001 = INT25
00010 = INT2 01010 = INT10 10010 = INT18 11010 = INT26
00011 = INT3 01011 = INT11 10011 = INT19 11011 = INT27
00100 = INT4 01100 = INT12 10100 = INT20 11100 = INT28
00101 = INT5 01101 = INT13 10101 = INT21 11101 = INT29
00110 = INT6 01110 = INT14 10110 = INT22 11110 = INT30
00111 = INT7 01111 = INT15 10111 = INT23
−
EXTINTF2EN External Interrupt Filter Selection Bit
0 = Disable
1 = Enable
EXTINT3SEL External Interrupt with Filter Selection Field
00000 = INT0 01000 = INT8 10000 = INT16 11000 = INT24
00001 = INT1 01001 = INT9 10001 = INT17 11001 = INT25
00010 = INT2 01010 = INT10 10010 = INT18 11010 = INT26
00011 = INT3 01011 = INT11 10011 = INT19 11011 = INT27
00100 = INT4 01100 = INT12 10100 = INT20 11100 = INT28
00101 = INT5 01101 = INT13 10101 = INT21 11101 = INT29
00110 = INT6 01110 = INT14 10110 = INT22 11110 = INT30
00111 = INT7 01111 = INT15 10111 = INT23
−
EXTINTF3EN External Interrupt Filter
0 = Disable
1 = Enable
NOTE1 Maximum 8 external interrupt among 31 external interrupt can have filter(min. 500ns)
Before changing external interrupt using filter, special care must be needed. The procedure like below
must be kept. The example is that EXTINT0SEL is changed from 00000 to 00001.
1. The mask bit of INT1 must be cleared for preventing unwanted interrupt.
2. The value of EXTINT0SEL is changed to 00001.
3. The pending bit of INT1 must be cleared.
NOTE2
4. The mask bit of INT1 is set to 1.