MAC7200 datasheet(909/976 Pages) FREESCALE

909 / 976 page

Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

831

NOTE

Not all Ports are available on all packages. In the case where a port, or some

pins in a port are not available on a package, the value of the corresponding

bit(s) in the DPORTIR register are indeterminate.

34.7

Functional Description

The Port Integration Module provides the means to utilize unused pins as General Purpose Inputs/Outputs

(GPIO), with the following configurable capabilities:

•

5V output drive with three selectable slew rates (Disabled, Slow, Fast)

•

Pull-up or pull-down

•

Open drain for wired-or connections

•

Interrupt capability (with glitch filtering and interrupt mask)

NOTE

All references in this section to GPO Mode do not apply to Port E.

34.7.1

Reset

After reset, all ports (Port A, B, C, D, E, F, G) are configured as General Purpose Inputs (See

Section 34.7.4, “General Purpose Input mode”). In addition, the JTAG pads are configured as follows:

•

TDI Pad:

— Input

— Pull-up enabled

•

TDO Pad:

— Output

— Fast slew rate enabled

•

TMS Pad:

— Input

— Pull-up enabled

•

TCK Pad:

— Input

— Pull-down enabled

Table 34-45. DPORTIR Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed 1

1. While these accesses are allowed, the intended use of this register is for 32-bits. For 8 and 16 bit port reads, it is recommended

to use the PORTIR register for each individual port instead. This will ensure better future compatibility.

Allowed1

Allowed

WRITE

Not Allowed

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