PC912XDP512F0MPVR datasheet(956/1348 Pages) FREESCALE

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Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

958

Freescale Semiconductor

23.0.5.65 Port AD0 Pull Up Enable Register 1 (PER1AD0)

Read: Anytime.

Write: Anytime.

This register activates a pull-up device on the respective pin PAD[07:00] if the port is used as input. This

bit has no effect if the port is used as output. Out of reset no pull device is enabled.

23.0.5.66 Port AD1 Data Register 0 (PT0AD1)

Read: Anytime.

Write: Anytime.

This register is associated with AD1 pins PAD[23:16]. These pins can also be used as general purpose I/O.

If the data direction bits of the associated I/O pins are set to 1, a read returns the value of the port register,

otherwise the value at the pins is read.

Table 23-59. RDR1AD0 Field Descriptions

Field

Description

7–0

RDR1AD0[7:0]

Reduced Drive Port AD0 Register 1

0 Full drive strength at output.

1 Associated pin drives at about 1/6 of the full drive strength.

76543210

PER1AD07

PER1AD06

PER1AD05

PER1AD04

PER1AD03

PER1AD02

PER1AD01

PER1AD00

Reset

00000000

Figure 23-67. Port AD0 Pull Up Enable Register 1 (PER1AD0)

Table 23-60. PER1AD0 Field Descriptions

Field

Description

7–0

PER1AD0[7:0]

Pull Device Enable Port AD0 Register 1

0 Pull-up device is disabled.

1 Pull-up device is enabled.

76543210

PT0AD123

PT0AD122

PT0AD121

PT0AD120

PT0AD119

PT0AD118

PT0AD117

PT0AD116

Reset

00000000

Figure 23-68. Port AD1 Data Register 0 (PT0AD1)

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