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| 型号： | ST7PLITE15BF0B3 |
| 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, PDIP20 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-20 |
| 文件页数： | 157/159页 |
| 文件大小： | 2855K |
| 代理商： | ST7PLITE15BF0B3 |
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ST7LITE1xB
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10-BIT A/D CONVERTER (ADC) (Cont’d)
11.5.3.2 Input Voltage Amplifier
The input voltage can be amplified by a factor of 8
by enabling the AMPSEL bit in the ADCDRL regis-
ter.
When the amplifier is enabled, the input range is
0V to VDD/8.
For example, if VDD = 5V, then the ADC can con-
vert voltages in the range 0V to 430mV with an
ideal resolution of 0.6mV (equivalent to 13-bit res-
olution with reference to a VSS to VDD range).
For more details, refer to the Electrical character-
istics section.
Note: The amplifier is switched on by the ADON
bit in the ADCCSR register, so no additional start-
up time is required when the amplifier is selected
by the AMPSEL bit.
11.5.3.3 Digital A/D Conversion Result
The conversion is monotonic, meaning that the re-
sult 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 VDDA
(high-level voltage reference) then the conversion
result is FFh in the ADCDRH register and 03h in
the ADCDRL register (without overflow indication).
If the input voltage (VAIN) is lower than VSSA (low-
level voltage reference) then the conversion result
in the ADCDRH and ADCDRL registers is 00 00h.
The A/D converter is linear and the digital result of
the conversion is stored in the ADCDRH and AD-
CDRL registers. The accuracy of the conversion is
described in the Electrical Characteristics 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.
11.5.3.4 A/D Conversion
The analog input ports must be configured as in-
put, 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 ADCCSR register:
– Select the CH[2:0] bits to assign the analog
channel to convert.
ADC Conversion mode
In the ADCCSR register:
Set the ADON bit to enable the A/D converter and
to start the conversion. From this time on, the ADC
performs a continuous conversion of the selected
channel.
When a conversion is complete:
– The EOC bit is set by hardware.
– The result is in the ADCDR registers.
A read to the ADCDRH or a write to any bit of the
ADCCSR register resets the EOC bit.
To read the 10 bits, perform the following steps:
1. Poll the EOC bit
2. Read ADCDRL
3. Read ADCDRH. This clears EOC automati-
cally.
To read only 8 bits, perform the following steps:
1. Poll EOC bit
2. Read ADCDRH. This clears EOC automati-
cally.
11.5.3.5 Changing the conversion channel
The application can change channels during con-
version.
When software modifies the CH[2:0] bits in the
ADCCSR register, the current conversion is
stopped, the EOC bit is cleared, and the A/D con-
verter starts converting the newly selected chan-
nel.
11.5.4 Low Power Modes
Note: The A/D converter may be disabled by re-
setting the ADON bit. This feature allows reduced
power consumption when no conversion is need-
ed and between single shot conversions.
11.5.5 Interrupts
None.
Mode
Description
WAIT
No effect on A/D Converter
HALT
A/D Converter disabled.
After wakeup from Halt mode, the A/D Con-
verter requires a stabilization time tSTAB (see
Electrical Characteristics) before accurate
conversions can be performed.
1
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