D.3.15 SWSR
— Software Service Register
15
NOT USED
RESET:
0
0
0
0
0
0
8
7
0
6
0
5
0
4
0
3
0
2
0
$YFFA27
1
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
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
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
NOT USED
RESET:
0
1
1
1
1
1
1
1
8
7
0
6
PC6
5
PC5
4
PC4
3
PC3
2
PC2
$YFFA30
$YFFA32
$YFFA34
D
$YFFA36
$YFFA38
$YFFA3A
$YFFA41
1
PC1
0
PC0
PORTC latches data for chip-select pins that are used for discrete output.
D.3.23 CSPAR0
— Chip Select Pin Assignment Register 0
15
0
RESET:
0
0
DATA2
1
DATA2
1
DATA2
1
DATA1
1
DATA1
1
DATA1
1
1
DATA0
14
0
13
12
11
10
9
CSPA0[4]
8
7
CSPA0[3]
6
5
CSPA0[2]
4
3
CSPA0[1]
2
$YFFA44
1
0
CSBOOT
CSPA0[6]
CSPA0[5]
MC68331
USER’S MANUAL
REGISTER SUMMARY
MOTOROLA
D-21
MOTOROLA [ MOTOROLA, INC ]
