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| 型号： | ST72774S9T1/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | TQFP-44 |
| 文件页数： | 29/144页 |
| 文件大小： | 1280K |
| 代理商： | ST72774S9T1/XXX |
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4.10.3.2 Digital A/D Conversion Result
The conversion is monotonic, meaning that the
result never decreases if the analog input does not
and never increases if the analog input does not.
If the input voltage (VAIN) is greater than or equal
to VDDA (high-level voltage reference) then the
conversion result in the DR register is FFh (full
scale) without overflow indication.
If input voltage (VAIN) is lower than or equal to
VSSA (low-level voltage reference) then the
conversion result in the DR register is 00h.
The A/D converter is linear and the digital result of
the conversion is stored in the ADCDR register.
The accuracy of the conversion is described in the
parametric section.
RAIN is the maximum recommended impedance
for an analog input signal. If the impedance is too
high, this will result in a loss of accuracy due to
leakage and sampling not being completed in the
alloted time.
4.10.3.3 A/D Conversion Phases
The A/D conversion is based on two conversion
phases as shown in Figure 77:
s
Sample capacitor loading [duration: tLOAD]
During this phase, the VAIN input voltage to be
measured is loaded into the CADC sample
capacitor.
s
A/D conversion [duration: tCONV]
During this phase, the A/D conversion is
computed (8 successive approximations cycles)
and the CADC sample capacitor is disconnected
from the analog input pin to get the optimum
analog to digital conversion accuracy.
While the ADC is on, these two phases are
continuously repeated.
At the end of each conversion, the sample
capacitor is kept
loaded
with
the
previous
measurement
load.
The
advantage
of
this
behaviour
is
that
it
minimizes
the
current
consumption on the analog pin in case of single
input channel measurement.
4.10.3.4 Software Procedure
Refer to the control/status register (CSR) and data
register (DR) in
Section 4.10.6 for the bit
definitions and to Figure 77 for the timings.
ADC Configuration
The total duration of the A/D conversion is 12 ADC
clock periods (1/fADC=4/fCPU).
The analog input ports must be configured as
input, no pull-up, no interrupt. Refer to the I/O
ports chapter. Using these pins as analog inputs
does not affect the ability of the port to be read as
a logic input.
In the CSR register:
– Select the CH[3:0] bits to assign the analog
channel to be converted.
ADC Conversion
In the CSR register:
– Set the ADON bit to enable the A/D converter
and to start the first conversion. From this time
on, the ADC performs a continuous conver-
sion of the selected channel.
When a conversion is complete
– The COCO bit is set by hardware.
– No interrupt is generated.
– The result is in the DR register and remains
valid until the next conversion has ended.
A write to the CSR register (with ADON set) aborts
the current conversion, resets the COCO bit and
starts a new conversion.
Figure 77. ADC Conversion Timings
4.10.4 Low Power Mode
Note: The A/D converter is disabled by resetting the
ADON bit. With this feature, power consumption is
reduced when no conversion is needed and be-
tween single shot conversions.
4.10.5 Interrupts
None
Mode
Description
WAIT
No effect on A/D Converter
ADCCSR WRITE
ADON
COCO BIT SET
tLOAD
tCONV
OPERATION
HOLD
CONTROL
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