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参数资料
| 型号： | AT83C5112 |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-bit Microcontroller with A/D Converter |
| 中文描述： | 8位微控制器与A / D转换器 |
| 文件页数： | 46/97页 |
| 文件大小： | 1229K |
| 代理商： | AT83C5112 |
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46
AT8xC5112
4191B
–
8051
–
04/03
Analog-to-Digital
Converter (ADC)
This section describes the on-chip 10-bit analog-to-digital converter of the
T89C51RB2/RC2. Eight ADC channels are available for sampling of the external
sources AN0 to AN7. An analog multiplexer allows the single ADC to select one of the 8
ADC channels as ADC input voltage (ADCIN). ADCIN is converted by the 10 bit-cas-
caded potentiometric ADC.
Three kind of conversions are available:
Standard conversion (7-8 bits).
Precision conversion (8-9 bits).
Accurate conversion (10 bits).
For the precision conversion, set bits PSIDLE and ADSST in ADCON register to start
the conversion. The chip is in a pseudo-idle mode, the CPU doesn
’
t run but the periph-
erals are always running. This mode allows digital noise to be lower, to ensure precise
conversion.
For the accurate conversion, set bits QUIETM and ADSST in ADCON register to start
the conversion. The chip is in a quiet mode, the AD is the only peripheral running. This
mode allows digital noise to be as low as possible, to ensure high precision conversion.
For these modes it is necessary to work with end of conversion interrupt, which is the
only way to wake up the chip.
If another interrupt occurs during the precision conversion, it will be treated only after
this conversion is ended.
Features
8 channels with multiplexed inputs
10 - bit cascaded potentiometric ADC
Conversion time down to 10 micro-seconds
Zero Error (offset) +/- 2 LSB max
External Positive Reference Voltage Range 2.4 to Vcc
ADCIN Range 0 to Vcc
Integral non-linearity typical 1 LSB, max. 2 LSB (with 0.9*Vcc<Vref<Vcc)
Differential non-linearity typical 0.5 LSB, max. 1 LSB (with 0.9*Vcc<Vref<Vcc)
Conversion Complete Flag or Conversion Complete Interrupt
Selected ADC Clock
ADC I/O Functions
AINx are general I/O that are shared with the ADC channels. The channel select bits in
ADCF register define which ADC channel pin will be used as ADCIN. The remaining
ADC channels pins can be used as general purpose I/O or as the alternate function that
is available. Writes to the port register which aren
’
t selected by the ADCF will not have
any effect.
相关PDF资料 |
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|---|---|
| AT87C5112 | 8-bit Microcontroller with A/D Converter |
| AT80C51RB2-3CSCM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-3CSIM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-3CSUM | 80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTIL | 80C51 High Performance ROM 8-bit Microcontroller |
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