MAC7200 datasheet(901/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

823

34.6.1.8

Pin Data Register (Port A, B, C, D, F, G)

Offset see Table 34-11

Access: see Table 34-25

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 34-9. Port Wide Input Register (PORTIR, Port E)

Table 34-24. PORTIR (Port E) 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.

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 34-25. PORTIR (Port E) Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed

Not Allowed

WRITE

Not Allowed

Offset see Table 34-11

Access: see Table 34-27

321

DATA

Reset

000

Figure 34-10. Pin Data Register (PINDATAxx, Port A, B, C, D, F, G)

Table 34-26. PINDATAxx (Port A, B, C, D, F, G) Field Descriptions

Field

Description

7–1

Reserved, should be cleared.

DATA

1-bit Write/Read Data Register. This 1-bit field provides a means to drive and sample individual pins without

the need for mask and shift operations in software, and is particularly useful for using the GPIO functionality of

a pin under DMA control. Writing/Reading to/from this register is functionally equivalent to writing/reading the

corresponding bit in the PORTDATA register, but without the need to mask and shift the value. (i.e.-Reading

from PINDATA3 is equivalent to reading PORTDATA, AND’ing the result with 0x0008, and shifting the result

right by 3 places). See Section 34.8.2.2.2, “Driving/Sampling Individual Pins,” for examples using this feature.

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