参数资料
型号: MC68HC05P9AMDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 25/158页
文件大小: 3885K
代理商: MC68HC05P9AMDW
ADC
120
ADC
PC6/AN0–
PC3/AN3
The multiplexer can select one of four external analog input channels
(AN0, AN1, AN2, or AN3) for sampling. The conversion takes 32 cycles.
The first 12 cycles sample the voltage on the selected input pin by
charging an internal capacitor. In the last 20 cycles, a comparator
successively compares the output of an internal D/A converter to the
sampled analog input. Control logic changes the D/A converter input one
bit at a time, starting with the MSB, until the D/A converter output
matches the sampled analog input. The conversion is monotonic and
has no missing codes. At the end of the conversion, the conversion
complete flag (CCF) becomes set, and the CPU takes two cycles to
move the result to the ADC data register.
NOTE:
To prevent excess power dissipation, do not simultaneously use an I/O
port pin as a digital input and an analog input.
While the ADC is on, the selected analog input reads as logic 0. The port
C pins that are not selected read normally.
An analog input voltage equal to V
RH converts to digital $FF; an input
voltage greater than V
RH converts to $FF with no overflow. An analog
input voltage less than V
SS converts to digital $00. For ratiometric
conversion, the source of each analog input should use V
RH as the
supply voltage and be referenced to V
SS.
The clock frequency must be equal to or greater than 1 MHz. If the
internal clock frequency is less than 1MHz, the internal RC oscillator
(nominally 1.5 MHz) must be used for the ADC conversion clock. Make
this selection by setting the ADRC bit to logic 1 in the ADC status and
control register.
Interrupts
The ADC cannot generate interrupt requests.
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For More Information On This Product,
Go to: www.freescale.com
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