MC9S08DN60F1CLF datasheet(86/356 Pages) FREESCALE

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Chapter 6 Parallel Input/Output Control

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

6.5.1.5

Port A Drive Strength Selection Register (PTADS)

6.5.1.6

Port A Interrupt Status and Control Register (PTASC)

76543210

PTADS7

PTADS6

PTADS5

PTADS4

PTADS3

PTADS2

PTADS1

PTADS0

Reset:

00000000

Figure 6-7. Drive Strength Selection for Port A Register (PTADS)

Table 6-5. PTADS Register Field Descriptions

Field

Description

7:0

PTADS[7:0]

Output Drive Strength Selection for Port A Bits — Each of these control bits selects between low and high

output drive for the associated PTA pin. For port A pins that are conﬁgured as inputs, these bits have no effect.

0 Low output drive strength selected for port A bit n.

1 High output drive strength selected for port A bit n.

76543210

0000

PTAIF

PTAIE

PTAMOD

PTAACK

Reset:

00000000

= Unimplemented or Reserved

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

Table 6-6. 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.

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