參數(shù)資料
型號: MC68HC705E6
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 65/140頁
文件大小: 788K
代理商: MC68HC705E6
MC68HC05E6 — Rev. 1.0
A-to-D Converter
A-to-D Converter
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
Introduction
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, V
REFL
, is internally connected to the VSS pin.
An input voltage equal to or greater than V
RH
converts to $FF (full scale)
with no overflow indication. For ratiometric conversions, the source of
each analog input should use V
REFH
as the supply voltage and be
referenced to V
REFL
.
1-adc
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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