MAC7200 datasheet(899/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

821

34.6.1.5

Port Wide Data Register (Port E)

NOTE

Because Port E implements only General Purpose Input (GPI) functionality,

the functionality of this register differs from the rest of the Ports. Careful

attention should be paid to the description of this register.

Table 34-18. PORTDATA (Port A, B, C, D, F, G) Field Descriptions

Field

Descriptions

15–0

DATA

16-bit Write/Read Data Register. This 16-bit field is used to drive and sample values to and from the associated

pins. It has the following functionality (on a pin-by-pin basis):

• In Peripheral Mode, the corresponding bit of the register is not used

• In GPIO Mode, when the pin is configured as an input (MODE=0, DDR=0), the corresponding bit in the

PORTDATA register reflects the value(s) driven onto the pin(s) by external hardware, not the value

previously written to the PORTDATA register. Note that there is a 2 clock cycle delay between the changing

of the value on a pin and the reflection of the new value in the PORTDATA register.

In GPIO Mode, when the pin is configured as an output (MODE=0, DDR=1), the corresponding bit in the

PORTDATA register is used to specify the value to drive onto the pin.

Table 34-19. PORTDATA (Port A, B, C, D, F, G) Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed

Not Recommended

WRITE

Allowed

Not Recommended

Offset see Table 34-11

Access: see Table 34-21

987

6543210

RDATA

Reset

0000

0000000

00000

Figure 34-7. Port Wide Data Register (PORTDATA Port E)

Table 34-20. PORTDATA (Port E) Field Descriptions

Field

Description

15–0

DATA

16-bit Write/Read Data Register. This 16-bit field is used to sample values to and from the associated pins. It

has the following functionality (on a pin-by-pin basis):

• In Peripheral Mode, the corresponding bit of the register is not used

• In GPI Mode the corresponding bit in the PORTDATA register reflects the value(s) driven onto the pin(s) by

external hardware. Note that there is a 2 clock cycle delay between the changing of the value on a pin and

the reflection of the new value in the PORTDATA regist

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