MC68331TS datasheet(30/84 Pages) FREESCALE

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MC68331TS/D

3.5.2 Pin Assignment Registers

The pin assignment registers (CSPAR0 and CSPAR1) contain pairs of bits that determine the function

of chip-select pins. The pin assignment encodings used in these registers are shown below.

CSPAR0 contains seven 2-bit fields that determine the functions of corresponding chip-select pins.

CSPAR0[15:14] are not used. These bits always read zero; writes have no effect. CSPAR0 bit 1 always

reads one; writes to CSPAR0 bit 1 have no effect.

CSPAR1 contains five 2-bit fields that determine the functions of corresponding chip-select pins.

CSPAR1[15:10] are not used. These bits always read zero; writes have no effect.

Table 12 Pin Assignment Encodings

Bit Field

Description

Discrete Output

Alternate Function

Chip Select (8-Bit Port)

Chip Select (16-Bit Port)

CSPAR0 —Chip Select Pin Assignment Register 0

$YFFA44

CSPA0[6]

CSPA0[5]

CSPA0[4]

CSPA0[3]

CSPA0[2]

CSPA0[1]

CSBOOT

RESET:

DATA2

DATA1

DATA0

Table 13 CSPAR0 Pin Assignments

CSPAR0 Field

Chip Select Signal

Alternate Signal

Discrete Output

CSPA0[6]

CS5

FC2

PC2

CSPA0[5]

CS4

FC1

PC1

CSPA0[4]

CS3

FC0

PC0

CSPA0[3]

CS2

BGACK

—

CSPA0[2]

CS1

—

CSPA0[1]

CS0

—

CSBOOT

——

CSPAR1 —Chip Select Pin Assignment Register 1

$YFFA46

CSPA1[4]

CSPA1[3]

CSPA1[2]

CSPA1[1]

CSPA1[0]

RESET:

DATA7

DATA

[7:6]

DATA

[7:5]

DATA

[7:4]

DATA

[7:3]

Table 14 CSPAR1 Pin Assignments

CSPAR0 Field

Chip Select Signal

Alternate Signal

Discrete Output

CSPA1[4]

CS10

ADDR23

ECLK

CSPA1[3]

CS9

ADDR22

PC6

CSPA1[2]

CS8

ADDR21

PC5

CSPA1[1]

CS7

ADDR20

PC4

CSPA1[0]

CS6

ADDR19

PC3

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