SC312XDP512F0MPVR datasheet(832/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

834

Freescale Semiconductor

22.3.2.11 S12X_EBI Ports, BKGD, VREGEN Pin Pull-up Control Register (PUCR)

Read: Anytime in single-chip modes.

Write: Anytime, except BKPUE which is writable in special test mode only.

This register is used to enable pull-up devices for the associated ports A, B, C, D, E, and K. Pull-up devices

are assigned on a per-port basis and apply to any pin in the corresponding port that is currently configured

as an input.

76543210

PUPKE

BKPUE

PUPEE

PUPDE

PUPCE

PUPBE

PUPAE

Reset

11010000

= Unimplemented or Reserved

Figure 22-13. S12X_EBI Ports, BKGD, VREGEN Pin Pull-up Control Register (PUCR)

Table 22-14. PUCR Field Descriptions

Field

Description

PUPKE

Pull-up Port K Enable

0 Port K pull-up devices are disabled.

1 Enable pull-up devices for Port K input pins.

BKPUE

BKGD and VREGEN Pin Pull-up Enable

0 BKGD and VREGEN pull-up devices are disabled.

1 Enable pull-up devices on BKGD and VREGEN pins.

PUPEE

Pull-up Port E Enable

0 Port E pull-up devices on bit 7, 4–0 are disabled.

1 Enable pull-up devices for Port E input pins bits 7, 4–0.

Note: Bits 5 and 6 of Port E have pull-down devices which are only enabled during reset. This bit has no effect

on these pins.

PUPDE

Pull-up Port D Enable

0 Port D pull-up devices are disabled.

1 Enable pull-up devices for all Port D input pins.

PUPCE

Pull-up Port C Enable

0 Port C pull-up devices are disabled.

1 Enable pull-up devices for all Port C input pins.

PUPBE

Pull-up Port B Enable

0 Port B pull-up devices are disabled.

1 Enable pull-up devices for all Port B input pins.

PUPAE

Pull-up Port A Enable

0 Port A pull-up devices are disabled.

1 Enable pull-up devices for all Port A input pins.

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