参数资料
型号: MC68HC05G1B
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封装: SDIP-56
文件页数: 107/124页
文件大小: 732K
代理商: MC68HC05G1B
MC68HC05G1
MOTOROLA
9-3
ANALOG TO DIGITAL CONVERTER
9
When the oscillator is turned on, it requires a time tADRC to stabilize (see Table 13-5 and
Table 13-6), and results can be inaccurate during this time. The ADRC bit allows the user to control
the A/D RC oscillator, which is used to provide a sufcient high speed clock rate for the A/D when
the MCU is running at low speeds. The A/D will take 32 bus cycles to complete a conversion. If
internal RC clock is selected as the clock source, it will take 32
s to complete a conversion.
ADON - A/D On
1 (set)
A/D enabled
0 (clear) –
A/D disabled
When the A/D is turned on, it requires a time tADON to stabilize (see Table 13-5 and Table 13-6)
and results can be inaccurate during this time.
CH3-CH0 - A/D Channels 3 to Channel 0
These bits select the A/D channel assignment (see Table 9-1).
Note:
Using one or more pins of PG0/AN0 - PG3/AN3 as analog inputs does not affect the
ability to use port G inputs as digital inputs. However, using port G for digital inputs
during analog conversion sequence may inject noise on the analog inputs and reduce
the accuracy of the A/D conversion.
Performing a digital read of port G with levels other than VDD or VSS on the inputs
causes greater than normal power dissipation during the read and may give erroneous
results.
TPG
79
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