D.3.15 SWSR — Software Service Register
$YFFA27
15
8
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
NOT USED
RESET:
0
0
0
0
0
0
0
0
When the software watchdog is enabled, a service sequence must be written to this
register within a specific interval. When read, SWSR always returns $00. Register
shown with read value.
D.3.16 TSTMSRA — Master Shift Register A
$YFFA30
$YFFA32
$YFFA34
$YFFA36
$YFFA38
$YFFA3A
$YFFA41
Register is used for factory test only.
D.3.17 TSTMSRB — Master Shift Register B
Register is used for factory test only.
D.3.18 TSTSC — Test Module Shift Count
D
Register is used for factory test only.
D.3.19 TSTRC — Test Module Repetition Count
Register is used for factory test only.
D.3.20 CREG — Test Submodule Control Register
Register is used for factory test only.
D.3.21 DREG — Distributed Register
Register is used for factory test only.
D.3.22 PORTC — Port C Data Register
15
8
7
0
6
5
4
3
2
1
0
NOT USED
PC6
PC5
PC4
PC3
PC2
PC1
PC0
RESET:
0
1
1
1
1
1
1
1
PORTC latches data for chip-select pins that are used for discrete output.
D.3.23 CSPAR0 — Chip Select Pin Assignment Register 0
$YFFA44
15
0
14
0
13
12
11
10
9
8
7
6
5
4
1
3
2
1
1
0
CSPA0[6]
CSPA0[5]
CSPA0[4]
CSPA0[3]
CSPA0[2]
CSPA0[1]
CSBOOT
RESET:
0
0
DATA2
1
DATA2
1
DATA2
1
DATA1
1
DATA1
DATA1
1
DATA0
MC68331
REGISTER SUMMARY
MOTOROLA
D-21
USER’S MANUAL
MOTOROLA [ MOTOROLA ]
