cp3cn23 National Semiconductor Corporation, cp3cn23 Datasheet - Page 75

• Manufacturer Part Number: cp3cn23
• Description: Cp3cn23 Reprogrammable Connectivity Processor With Dual Can Interfaces
• Manufacturer: National Semiconductor Corporation

The Global Configuration Register (ADCGCR) provides the
flexibility to implement any of these techniques.
15.3
To reduce the level of switching noise in the environment of
the ADC, it is possible to operate the CP3CN23 in low-pow-
er modes, in which the System Clock is slowed or switched
off. Under these conditions, Auxiliary Clock 2 can be select-
ed as the clock source for the ADC module, however con-
version results cannot be read by the system while the
System Clock is suspended. The expected operation in
power-saving modes is therefore:
To conserve power, the ADC should be disabled before en-
tering a low-power mode if its function is not required.
15.4
The ADC module provides support for an In-System Emula-
tor by means of a special FREEZE input. When FREEZE is
asserted the module will exhibit the following specific be-
havior:
T The automatic clear-on-read function of the result regis-
T The FIFO is updated as usual, and an interrupt for a
3. By extension, the ADC negative voltage reference can
1. ADC is configured and a conversion is primed or trig-
2. A power-saving mode is entered.
3. ADC conversion completes and a wake-up signal is as-
4. Device wakes up and processes the conversion result.
ter (ADCRESLT) is disabled.
completed conversion can be asserted.
be internally connected to the TSY- terminal, to recover
the full 4096 values.
gered.
serted to the MIWU unit.
ADC OPERATION IN POWER-SAVING
MODES
FREEZE
75
15.5
Table 31 lists the ADC registers.
ADCCNTRL
ADCSCDLY
ADCSTART
ADCRESLT
ADCGCR
ADCACR
Name
ADC REGISTER SET
Table 31 ADC Registers
FF F3C2h
FF F3C4h
FF F3C6h
FF F3C8h
FF F3CAh
FF F3C0h
Address
Configuration Register
Configuration Register
ADC Start Conversion
ADC Start Conversion
ADC Result Register
ADC Conversion
Control Register
Delay Register
ADC Auxiliary
Description
ADC Global
Register
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