MC68332
REGISTER SUMMARY
USER’S MANUAL
D-13
D.2.24 CSPAR1
— Chip Select Pin Assignment Register 1
$YFFA46
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.
*Does not apply to the CSBOOT field
D.2.25 CSBARBT
— Chip Select Base Address Register Boot ROM
$YFFA48
D.2.26 CSBAR[0:10]
— Chip Select Base Address Registers
$YFFA4C–$YFFA74
Each chip-select pin has an associated base address register. A base address is the
lowest address in the block of addresses enabled by a chip select. CSBARBT contains
the base address for selection of a bootstrap peripheral memory device. Bit and field
definition for CSBARBT and CSBAR[0:10] are the same, but reset block sizes differ.
ADDR[23:11] — Base Address
This field sets the starting address of a particular address space.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
CSPA1[4]
CSPA1[3]
CSPA1[2]
CSPA1[1]
CSPA1[0]
RESET:
0
0
0
0
0
0
DATA7
1
DATA6
1
DATA5
1
DATA4
1
DATA3
1
CSPAR1 Pin Assignments
CSPAR1 Field
CSPAR1 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
Pin Assignment Field Encoding
Bit Field
Description
00
Discrete Output*
01
Alternate Function*
10
Chip Select (8-Bit Port)
11
Chip Select (16-Bit Port)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
0
ADDR
23
ADDR
22
ADDR
21
ADDR
20
ADDR
19
ADDR
18
ADDR
17
ADDR
16
ADDR
15
ADDR
14
ADDR
13
ADDR
12
ADDR
11
BLKSZ
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
15
14
13
12
11
10
9
8
7
6
5
4
3
2
0
ADDR
23
ADDR
22
ADDR
21
ADDR
20
ADDR
19
ADDR
18
ADDR
17
ADDR
16
ADDR
15
ADDR
14
ADDR
13
ADDR
12
ADDR
11
BLKSZ
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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