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ADuC7060
ADC Comparator and Accumulator
Every primary ADC result can be compared to a preset threshold
level (ADC0TH) as configured via ADCCFG[4:3]. An MCU
interrupt is generated if the absolute (sign independent) value
of the ADC result is greater than the preprogrammed com-
parator threshold level. An extended function of this comparator
function allows user code to configure a threshold counter
(ADC0THV) to monitor the number of pimary ADC results
that have occurred above or below the preset threshold level.
Again, an ADC interrupt is generated when the threshold
counter reaches a preset value (ADC0RCR).
Finally, a 32-bit accumulator (ADC0ACC) function can be
configured (ADCCFG[6:5]) allowing the primary ADC to add
(or subtract) multiple primary ADC sample results. User code
can read the accumulated value directly (ADC0ACC) without
any further software processing.
TEMPERATURE SENSOR
The ADuC7060 provides a voltage output from an on-chip band
gap reference proportional to absolute temperature. This voltage
output can also be routed through the front-end auxiliary ADC
ADC MMR Interface
The ADCs are controlled and configured through a number of
MMRs that are described in detail in the following sections.
In response to an ADC interrupt, user code should interrogate
the ADCSTA MMR to determine the source of the interrupt.
Each ADC interrupt source can be individually masked via the
ADCMSKI MMR described in Table 39.
All primary ADC result ready bits are cleared by a read of the
ADC0DAT MMR. If the primary channel ADC is not enabled,
all ADC result ready bits are cleared by a read of the ADC1DAT
MMR. To ensure that primary ADC and auxiliary ADC
conversion data are synchronous, user code should first read
the ADC1DAT MMR and then the ADC0DAT MMR. New
ADC conversion results are not written to the ADCxDAT
MMRs unless the respective ADC result ready bits are first
cleared. The only exception to this rule is the data conversion
result updates when the ARM core is powered down. In this
mode, ADCxDAT registers always contain the most recent ADC
conversion result even though the ready bits are not cleared.
ADC Status Register
multiplexer (effectively, an additional ADC channel input),
facilitating an internal temperature sensor channel that
measures die temperature.
The internal temperature sensor is not designed for use as
an absolute ambient temperature calculator. It is intended
for use as an approximate indicator of the temperature of
the ADuC7060 die.
The typical temperature coefficient is 0.28 mV/°C.
140
120
100
80
60
40
20
Name:
Address:
Default value:
Access:
Function:
ADCSTA
0xFFFF0500
0x0000
Read only
This read-only register holds general status
information related to the mode of operation
or current status of the ADuC7060 ADCs.
0
–60
–40
–20
0
20
40
60
80
100
120
140
TEMPERATURE (°C)
Figure 15. ADC Output vs. Temperature
Rev. 0 | Page 36 of 100
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