Memory Map/Register Definition

26.3.2.5Port B/C/D Pin Assignment Register (PBCDPAR)

The PBCDPAR controls the pin function of ports B, C, and D. The PBCDPAR register is read/write.

 

7

6

5

0

Field

PBPA

PCDPA

 

 

 

 

 

 

Reset

See Note 1

See Note 1

 

00_0000

 

 

 

 

 

R/W:

R/W

R/W

 

R

 

 

 

 

 

Address

 

 

 

IPSBAR + 0x10_0050

 

 

 

 

 

Figure 26-18. Port B/C/D Pin Assignment Register (PBCDPAR)

1Reset state determined during reset configuration as shown in Table 26-8.

Table 26-7. PBCDPAR Field Descriptions

Bits

Name

 

Description

 

 

 

7

PBPA

Port B pin assignment. Configures the port B pins for their primary function

 

 

(D[23:16]) or digital I/O.

 

 

1

Port B pins configured for primary function (D[23:16])

 

 

0

Port B pins configured for digital I/O

 

 

 

6

PCDPA

Ports C,D pin assignment. Configures the port C and D pins for their primary

 

 

functions (D[15:8], D[7:0]) or digital I/O.

 

 

1

Port C,D pins configured for primary function (D[15:8], D[7:0])

 

 

0

Port C,D pins configured for digital I/O

 

 

 

5–0

Reserved, should be cleared.

 

 

 

 

Table 26-8. Reset Values for PBCDPAR Bits

 

Port Size of

PBPA Reset

PCDPA Reset

Mode of Operation

External Boot

Value

Value

 

Device 1

 

 

 

Master mode

8-bit

0

0

 

 

 

 

 

16-bit

1

0

 

 

 

 

 

32-bit

1

1

 

 

 

 

Single chip mode

N/A

0

0

 

 

 

 

1Note if the port size of the external boot device is less than the port size of the external SDRAM, the PBCDPAR register must be written after reset to enable the primary function(s) on ports B,C, and D, before any SDRAM accesses are attempted.

26-14

MCF5282 User’s Manual

MOTOROLA

Page 572
Image 572
Motorola MCF5282 Port B/C/D Pin Assignment Register Pbcdpar, Pbcdpar Field Descriptions, Reset Values for Pbcdpar Bits