REGISTER SUMMARY
M68HC16 Z SERIES
D-30
USER’S MANUAL
D.5.1 ADC Module Configuration Register
ADCMCR controls ADC operation during low-power stop mode, background debug
mode, and freeze mode.
STOP — Low-Power Stop Mode Enable
0 = Normal operation
1 = Low-power operation
STOP places the ADC in low-power state. Setting STOP aborts any conversion in
progress. STOP is set to logic level one during reset, and may be cleared to logic level
zero by the CPU16. Clearing STOP enables normal ADC operation. However, be-
cause analog circuitry bias current has been turned off, there is a period of recovery
before output stabilization.
FRZ[1:0] — Freeze Assertion Response
The FRZ field determines ADC response to assertion of the FREEZE signal when the
device is placed in background debug mode. Refer to
SUPV — Supervisor/Unrestricted
This bit has no effect because the CPU16 always operates in supervisor mode.
D.5.2 ADC Test Register
ADCTEST — ADC Test Register
$YFF702
Used for factory test only.
D.5.3 Port ADA Data Register
Port ADA is an input port that shares pins with the A/D converter inputs.
ADCMCR — ADC Module Configuration Register
$YFF700
15
14
13
12
8
7
6
0
STOP
FRZ
NOT USED
SUPV
NOT USED
RESET:
1
0
0
1
Table D-25 Freeze Encoding
FRZ[1:0]
Response
00
Ignore FREEZE, continue conversions
01
Reserved
10
Finish conversion in process, then freeze
11
Freeze immediately
PORTADA — Port ADA Data Register
$YFF706
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
PADA7
PADA6
PADA5
PADA4
PADA3
PADA2
PADA1
PADA0
RESET:
REFLECTS STATE OF THE INPUT PINS
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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