Datasheet

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ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 Interrupts
169
External interrupt selection register (EISR)
Read/Write
Reset Value: 0000 1100 (0Ch)
• Bits 7:6 = ei3[1:0] ei3 pin selection
These bits are written by software. They select the Port B I/O pin used for the ei3
external interrupt according to the table below.
• Bits 5:4 = ei2[1:0] ei2 pin selection
These bits are written by software. They select the Port B I/O pin used for the ei2
external interrupt according to the table below.
• Bit 3:2 = ei1[1:0] ei1 pin selection
These bits are written by software. They select the Port A I/O pin used for the ei1
external interrupt according to the table below.
7 0
IS31 IS30 IS21 IS20 IS11 IS10 IS01 IS00
Table 14. External interrupt I/O pin ei3[1:0] selection
ei31 ei30 I/O pin
0 0 PB0
(1)
1. Reset state
0 1 PB1
1 0 PB2
Table 15. External interrupt I/O pin ei2[1:0] selection
ei21 ei20 I/O pin
0 0 PB3
(1)
1. Reset state
0 1 PB4
(2)
2. PB4 cannot be used as an external interrupt in HALT mode.
1 0 PB5
1 1 PB6