MAC7200 datasheet(900/976 Pages) FREESCALE

900 / 976 page

Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

822

Freescale Semiconductor

34.6.1.6

Port Wide Input Register (Port A, B, C, D, F, G)

34.6.1.7

Port Wide Input 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 34-21. PORTDATA (Port E) Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed

Not Recommended

WRITE

Not Allowed

Offset see Table 34-11

Access: see Table 34-23

987

6543210

RDATA

Reset 0/11

0/11

1 The reset value of this register depends on the value of the pins at the time of the first register READ after reset.

Figure 34-8. Port Wide Input Register (PORTIR, Port A, B, C, D, F, G)

Table 34-22. PORTIR (Port A, B, C, D, F, G) Field Descriptions

Field

Description

15–0

DATA

16-bit Port Read Register. This 16-bit read-only register reads back the value on the associated pins, and can

be used to detect overload or short circuit conditions on output pins. Functionally, it is related to the PORTDATA

• When the pin is configured as an input (DDR=0), reading the PORTDATA and PORTIR registers will yield

the same result

• When the pin is configured as an output (DDR=1), reading the PORTIR register will yield the value on the

pin, while reading the PORTDATA register will yield the value in the PORTDATA register. If the pin is in

Peripheral Mode (MODE=1), then the value in the PORTDATA register may not be the same as the value

driven onto the pin by the peripheral.

Note: There is a 2 cycle synchronization that is performed on pin values before registering the value.

Therefore, there must be a minimum 2 system clock cycles between the time a pin is driven, and the

time that the register read is performed.

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 PORTIR register are indeterminate.

Table 34-23. PORTIR (Port A, B, C, D, F, G) Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed

Not Allowed

WRITE

Not Allowed

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