SC312XDP512F0MPVR datasheet(948/1348 Pages) FREESCALE

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Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

950

Freescale Semiconductor

23.0.5.51 Port H Polarity Select Register (PPSH)

Read: Anytime.

Write: Anytime.

This register serves a dual purpose by selecting the polarity of the active interrupt edge as well as selecting

a pull-up or pull-down device if enabled.

23.0.5.52 Port H Interrupt Enable Register (PIEH)

Read: Anytime.

Write: Anytime.

This register disables or enables on a per-pin basis the edge sensitive external interrupt associated with

Port H.

Table 23-47. PERH Field Descriptions

Field

Description

7–0

PERH[7:0]

Pull Device Enable Port H

0 Pull-up or pull-down device is disabled.

1 Either a pull-up or pull-down device is enabled.

76543210

PPSH7

PPSH6

PPSH5

PPSH4

PPSH3

PPSH2

PPSH1

PPSH0

Reset

00000000

Figure 23-53. Port H Polarity Select Register (PPSH)

Table 23-48. PPSH Field Descriptions

Field

Description

7–0

PPSH[7:0]

Polarity Select Port H

0 Falling edge on the associated port H pin sets the associated ﬂag bit in the PIFH register.

A pull-up device is connected to the associated port H pin, if enabled by the associated bit in register PERH

and if the port is used as input.

1 Rising edge on the associated port H pin sets the associated ﬂag bit in the PIFH register.

A pull-down device is connected to the associated port H pin, if enabled by the associated bit in register PERH

and if the port is used as input.

76543210

PIEH7

PIEH6

PIEH5

PIEH4

PIEH3

PIEH2

PIEH1

PIEH0

Reset

00000000

Figure 23-54. Port H Interrupt Enable Register (PIEH)

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