MAC7200 datasheet(897/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

819

Offset see Table 34-11

Access: see Table 34-15

987

6543210

0000

PULL

PIER

PIFR

Reset

0000

0000000

00000

Figure 34-4. Pin Configuration Register (CONFIGxx, Port E)

Table 34-14. CONFIGxx (Port E) Field Descriptions

Field

Description

15–8

Reserved, should be cleared.

MODE

Pin Mode Register. This bit switches the associated pin between Peripheral and GPI Modes

0GPI Mode

1 Peripheral Mode

6–4

Reserved, should be cleared.

3–2

PULL

Pull-up/Pull-down Enable Register. These bits 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. Pull-ups/pull-downs may be

enabled or disabled anytime, but only take effect when the pin is in GPIO mode. In Peripheral mode the

peripheral takes control of the pull configuration and interrupt functionality is disabled.

PIER

Pin Interrupt Enable Register. This bit masks the interrupt associated with a particular Pin Interrupt Flag

cleared, then no interrupt will occur if the Flag Register bit is set. Note that this bit does not affect the

setting/clearing of the Flag Register bit, it only determines whether a system interrupt will be generated or not.

0 Interrupt is masked

1 Interrupt is generated when PIFR is set by an active edge

PIFR

Pin Interrupt Flag Register. This bit signals that an active edge (i.e.-external interrupt) has been detected.

Writing a ’1’ to this bit clears the pending interrupt. Writing ’0’ has no effect. Interrupts are enabled on the pin

only when the pin is in GPI Mode (MODE=0).

0 No active edge pending.

1 An active edge has been detected on the corresponding pin. If the PIER bit is also set, an interrupt will occur.

Table 34-15. CONFIGxx (Port E) Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Not Recommended 1

Allowed

Allowed 2

(Reads multiple CONFIG registers)

WRITE

Not Recommended 1

Allowed

Allowed 2

(Writes multiple CONFIG registers)

Value

Function

External Interrupt Edge

No Pull-up/Pull-down

Rising Edge

No Pull-up/Pull-down

Falling Edge

Pull-down Enabled

Rising Edge

Pull-up Enabled

Falling Edge

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