MC68HC16Z1CAG16 Datasheet, PDF (390/500 Pages) Freescale Semiconductor, Inc – M68HC16Z Series users manual

Freescale Semiconductor, Inc.
Table D-8 Pin Assignment Field Encoding
CSxPA[1:0]
Description
00
Discrete output¹
01
Alternate function¹
10
Chip-select (8-bit port)
11
Chip-select (16-bit port)
NOTES:
1. Does not apply to the CSBOOT field.
This register contains seven 2-bit fields that determine the function of corresponding
chip-select pins. Bits [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. The
alternate functions can be enabled by data bus mode selection during reset. This reg-
ister may be read or written at any time. After reset, software may enable one or more
pins as discrete outputs.
Table D-9 shows CSPAR0 pin assignments.
Table D-9 CSPAR0 Pin Assignments
CSPAR0 Field Chip-Select Signal
CS5PA[1:0]
CS5
CS4PA[1:0]
CS4
CS3PA[1:0]
CS3
CS2PA[1:0]
CS2
CS1PA[1:0]
CS1
CS0PA[1:0]
CS0
CSBTPA[1:0]
CSBOOT
Alternate Signal
FC2
FC1
FC0
BGACK
BG
BR
—
Discrete Output
PC2
PC1
PC0
—
—
—
—
CSPAR1 — Chip-Select Pin Assignment Register 1
15
14
13
12
11
10
9
8
7
6
0
0
0
0
0
0
CS10PA[1:0]
CS9PA[1:0]
RESET:
0
0
0
0
0
0 _DATA7¹ 1
DATA
[7:6]¹
1
NOTES:
1. Refer to Table D-11 for CSPAR1 reset state information.
5
4
CS8PA[1:0]
DATA
[7:5]¹
1
$YFFA46
3
2
CS7PA[1:0]
1
0
CS6PA[1:0]
DATA
DATA
[7:4]¹
1
[7:3]¹
1
CSPAR1 contains five 2-bit fields that determine the functions of corresponding chip-
select pins. Bits [15:10] are not used. These bits always read zero; writes have no ef-
fect. Table D-10 shows CSPAR1 pin assignments, including alternate functions that
can be enabled by data bus mode selection during reset.
D-16
REGISTER SUMMARY
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M68HC16 Z SERIES
USER’S MANUAL