Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Uživatelský manuál stáhnout pdf (Strana 40)

MAXQ Family User’s Guide:

MAXQ2000 Supplement

Each of the read-only bits in this register reflects the logic state present at the corresponding port pin.

Each bit in this register controls the edge select mode for an external interrupt, as follows:

0 = The external interrupt will trigger on a rising (positive) edge.

1 = The external interrupt will trigger on a negative (falling) edge.

Bit 0: (EIES0.0) Edge Select for External Interrupt 0 (IT0)

Bit 1: (EIES0.1) Edge Select for External Interrupt 1 (IT1)

Bit 2: (EIES0.2) Edge Select for External Interrupt 2 (IT2)

Bit 3: (EIES0.3) Edge Select for External Interrupt 3 (IT3)

Bit 4: (EIES0.4) Edge Select for External Interrupt 4 (IT4)

Bit 5: (EIES0.5) Edge Select for External Interrupt 5 (IT5)

Bit 6: (EIES0.6) Edge Select for External Interrupt 6 (IT6)

Bit 7: (EIES0.7) Edge Select for External Interrupt 7 (IT7)

Each of the bits in this register controls the input/output direction of a port pin (P0.0 to P0.7), as follows.

0 = The port pin is in input mode, either with a weak pullup (if PO = 1) or tri-stated (if PO = 0).

1 = The port pin is in output mode, with the output level to drive given by PO.

Bit # 76543210

Name PI3.7 PI3.6 PI3.5 PI3.4 PI3.3 PI3.2 PI3.1 PI3.0

Reset ssssssss

Access r rrrrrrr

Bit # 76543210

Name IT7 IT6 IT5 IT4 IT3 IT2 IT1 IT0

Reset 00000000

Access r/w r/w r/w r/w r/w r/w r/w r/w

Bit # 76543210

Name PD0.7 PD0.6 PD0.5 PD0.4 PD0.3 PD0.2 PD0.1 PD0.0

Reset 00000000

Access r/w r/w r/w r/w r/w r/w r/w r/w

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Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Uživatelský manuál Strana 40