mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 230

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

D
D.3.24 CSPAR1 — Chip Select Pin Assignment Register 1
D-22
15
0
0
RESET:
Contains seven 2-bit fields, CSPA0[6:1] and CSBOOT, that determine the functions of
corresponding chip-select pins. CSPAR0[15:14] are not used. These bits always read
zero; write has no effect. CSPAR0 bit 1 always reads one; writes to CSPAR0 bit 1 have
no effect. The alternate functions can be enabled by data bus mode selection during
reset.
Contains five 2-bit fields (CSPA1[4:0]) that determine the functions of corresponding
chip-select pins. CSPAR1[15:10] are not used. These bits always read zero; write has
no effect. The CSPAR1 pin assignments table shows alternate functions that can be
enabled by data bus mode selection during reset.
14
0
0
Table D-10 CSPAR0 and CSPAR1 Pin Assignment Field Encoding
13
0
0
CSPAR0 Field
CSPAR1 Field
CSPA0[6]
CSPA0[5]
CSPA0[4]
CSPA0[3]
CSPA0[2]
CSPA0[1]
CSBOOT
12
CSPA1[4]
CSPA1[3]
CSPA1[2]
CSPA1[1]
CSPA1[0]
0
0
11
0
0
Freescale Semiconductor, Inc.
*Does not apply to the CSBOOT field
10
Table D-8 CSPAR0 Pin Assignments
Table D-9 CSPAR1 Pin Assignments
0
0
For More Information On This Product,
Bit Field
DATA7
CSPAR0 Signal
CSPAR1 Signal
9
CSPA1[4]
00
01
10
11
CSBOOT
Go to: www.freescale.com
CS10
REGISTER SUMMARY
CS5
CS4
CS3
CS2
CS1
CS0
CS9
CS8
CS7
CS6
8
1
DATA6
7
CSPA1[3]
Chip Select (16-Bit Port)
Chip Select (8-Bit Port)
Alternate Function*
Alternate Signal
Discrete Output*
Alternate Signal
Description
6
1
ADDR23
ADDR22
ADDR21
ADDR20
ADDR19
BGACK
FC2
FC1
FC0
BG
BR
—
DATA5
5
CSPA1[2]
4
1
Discrete Output
Discrete Output
DATA4
ECLK
PC6
PC5
PC4
PC3
3
CSPA1[1]
PC2
PC1
PC0
—
—
—
—
2
1
USER’S MANUAL
DATA3
$YFFA46
1
CSPA1[0]
MC68331
0
1