參數(shù)資料
型號: MC68HC05E6VDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數(shù): 103/140頁
文件大?。?/td> 1141K
代理商: MC68HC05E6VDWR2
MC68HC05E6 — Rev. 1.0
MOTOROLA
A-to-D Converter
65
A-to-D Converter
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
A/D converter operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
A/D registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
A/D converter during WAIT mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
A/D converter during STOP mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
A/D analog input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
The analog to digital converter system consists of a four-channel,
multiplexed input and a successive approximation A/D converter. The
four A/D input channels are connected to pins PG0–PG3 and the
particular input to be selected is determined by the setting/clearing of the
CHx bits in the A/D status/control register at $11 (ADSTAT). A further
four channels are available internally for test purposes. In addition to the
ADSTAT register there is one 8-bit result data register at address $10
(ADDATA).
NOTE:
PG1–PG3 are not available in the 28-pin package; in this package the
A/D converter has only one external input line.
The A/D converter is ratiometric and a dedicated pin, VREFH, is used to
supply the upper reference voltage level of each analog input. The lower
voltage reference point, VREFL, is internally connected to the VSS pin.
An input voltage equal to or greater than VRH converts to $FF (full scale)
with no overflow indication. For ratiometric conversions, the source of
each analog input should use VREFH as the supply voltage and be
referenced to VREFL.
1-adc
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