HCS08 datasheet(82/316 Pages) NXP

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Chapter 6 Parallel Input/Output Control

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

6.6.1.5

Port A Drive Strength Selection Register (PTADS)

6.6.1.6

Port A Interrupt Status and Control Register (PTASC)

321

PTADS3

PTADS2

PTADS1

PTADS0

Reset:

000

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

Table 6-6. PTADS Register Field Descriptions

Field

Description

5:4

Reserved

Reserved Bits — These bits are unused on this MCU, writes have no affect and could read as 1s or 0s.

3:0

PTADS[3:0]

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.

321

000

PTAIF

PTAIE

PTAMOD

PTAACK

Reset:

000

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.

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