MC9S08SH4MPJR datasheet(87/341 Pages) FREESCALE

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Chapter 6 Parallel Input/Output Control

MC9S08SH8 MCU Series Data Sheet, Rev. 3

Freescale Semiconductor

6.6.1.6

Port A Interrupt Status and Control Register (PTASC)

6.6.1.7

Port A Interrupt Pin Select Register (PTAPS)

76543210

0000

PTAIF

PTAIE

PTAMOD

PTAACK

Reset:

00000000

Figure 6-8. Port A Interrupt Status and Control Register (PTASC)

Table 6-7. PTASC Register Field Descriptions

Field

Description

PTAIF

Port A Interrupt Flag — PTAIF indicates when a port A interrupt is detected. Writes have no effect on PTAIF.

0 No port A interrupt detected.

1 Port A interrupt detected.

PTAACK

Port A Interrupt Acknowledge — Writing a 1 to PTAACK is part of the ﬂag clearing mechanism. PTAACK

always reads as 0.

PTAIE

Port A Interrupt Enable — PTAIE determines whether a port A interrupt is requested.

0 Port A interrupt request not enabled.

1 Port A interrupt request enabled.

PTAMOD

Port A Detection Mode — PTAMOD (along with the PTAES bits) controls the detection mode of the port A

interrupt pins.

0 Port A pins detect edges only.

1 Port A pins detect both edges and levels.

76543210

0000

PTAPS3

PTAPS2

PTAPS1

PTAPS0

Reset:

00000000

Figure 6-9. Port A Interrupt Pin Select Register (PTAPS)

Table 6-8. PTAPS Register Field Descriptions

Field

Description

3:0

PTAPS[3:0]

Port A Interrupt Pin Selects — Each of the PTAPSn bits enable the corresponding port A interrupt pin.

0 Pin not enabled as interrupt.

1 Pin enabled as interrupt.

MC9S08SH4MPJR Datasheet(PDF) 87 Page - Freescale Semiconductor, Inc

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