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ST72321xx-Auto Interrupts
Doc ID 13829 Rev 1 59/243
7.6.2 External interrupt control register (EICR)
EICR Reset value: 0000 0000 (00h)
76543210
IS1[1:0] IPB IS2[1:0] IPA TLIS TLIE
RW RW RW RW RW RW
Table 21. EICR register description
Bit Name Function
7:6 IS1[1:0]
ei2 and ei3 sensitivity
The interrupt sensitivity, defined using the IS1[1:0] bits, is applied to the following
external interrupts:
- ei2 (port B3..0) (see Tabl e 22)
- ei3 (port B7..4) (see Table 2 3)
These 2 bits can be written only when I1 and I0 of the CC register are both set to 1
(level 3).
5IPB
Interrupt polarity for port B
This bit is used to invert the sensitivity of the port B [3:0] external interrupts. It can
be set and cleared by software only when I1 and I0 of the CC register are both set
to 1 (level 3).
0: No sensitivity inversion
1: Sensitivity inversion
4:3 IS2[1:0]
ei0 and ei1 sensitivity
The interrupt sensitivity, defined using the IS2[1:0] bits, is applied to the following
external interrupts:
- ei0 (port A3..0) (see Table 2 4)
- ei1 (port F2..0) (see Ta bl e 2 5 )
These 2 bits can be written only when I1 and I0 of the CC register are both set to 1
(level 3).
2IPA
Interrupt polarity for port A
This bit is used to invert the sensitivity of the port A [3:0] external interrupts. It can
be set and cleared by software only when I1 and I0 of the CC register are both set
to 1 (level 3).
0: No sensitivity inversion
1: Sensitivity inversion
1TLIS
TLI sensitivity
This bit allows to toggle the TLI edge sensitivity. It can be set and cleared by
software only when TLIE bit is cleared.
0: Falling edge
1: Rising edge
0TLIE
TLI enable
This bit allows to enable or disable the TLI capability on the dedicated pin. It is set
and cleared by software.
0: TLI disabled
1: TLI enabled
Note: A parasitic interrupt can be generated when clearing the TLIE bit.
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