M68HC16 Z SERIES
REGISTER SUMMARY
USER’S MANUAL
D-17
The reset state of DATA[7:3] determines whether pins controlled by CSPAR1 are ini-
tially configured as high-order address lines or chip-selects.
shows the
correspondence between DATA[7:3] and the reset configuration of CS[10:6]/
ADDR[23:19]. This register may be read or written at any time. After reset, software
may enable one or more pins as discrete outputs.
D.2.18 Chip-Select Base Address Register Boot
D.2.19 Chip-Select Base Address Registers
Table D-10 CSPAR1 Pin Assignments
CSPAR1 Field
Chip-Select Signal
Alternate Signal
Discrete Output
CS10PA[1:0]
CS10
ADDR23
1
NOTES:
1. On the CPU16, ADDR[23:20] follow the logic state of ADDR19 unless externally
driven.
ECLK
CS9PA[1:0]
CS9
ADDR22
PC6
CS8PA[1:0]
CS8
ADDR21
PC5
CS7PA[1:0]
CS7
ADDR20
PC4
CS6PA[1:0]
CS6
ADDR19
PC3
Table D-11 Reset Pin Function of CS[10:6]
Data Bus Pins at Reset
Chip-Select/Address Bus Pin Function
DATA7
DATA6
DATA5
DATA4
DATA3
CS10/
ADDR23
CS9/
ADDR22
CS8/
ADDR21
CS7/
ADDR20
CS6/
ADDR19
1
1
1
1
1
CS10
CS9
CS8
CS7
CS6
1
1
1
1
0
CS10
CS9
CS8
CS7
ADDR19
1
1
1
0
X
CS10
CS9
CS8
ADDR20 ADDR19
1
1
0
X
X
CS10
CS9
ADDR21 ADDR20 ADDR19
1
0
X
X
X
CS10
ADDR22 ADDR21 ADDR20 ADDR19
0
X
X
X
X
ADDR23 ADDR22 ADDR21 ADDR20 ADDR19
CSBARBT — Chip-Select Base Address Register Boot
$YFFA48
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
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[2:0]
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
CSBAR[0:10] — Chip-Select Base Address Registers
$YFFA4C–$YFFA74
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
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[2:0]
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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