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| 型号： | M68HC05M68H |
| 厂商： | Motorola, Inc. |
| 英文描述： | HCMOS Microcontroller Unit |
| 中文描述： | HCMOS微控制器 |
| 文件页数： | 78/130页 |
| 文件大小： | 1541K |
| 代理商： | M68HC05M68H |
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Analog Subsystem
Advance Information
MC68HC705P6A
—
Rev. 2.0
78
Analog Subsystem
MOTOROLA
9.3 Analog Section
The following paragraphs describe the operation and performance of
analog modules within the analog subsystem.
9.3.1 Ratiometric Conversion
The A/D converter is ratiometric, with pin V
REFH
supplying the high
reference voltage. Applying an input voltage equal to V
REFH
produces a
conversion result of $FF (full scale). Applying an input voltage equal to
V
SS
produces a conversion result of $00. An input voltage greater than
V
REFH
will convert to $FF with no overflow indication. For ratiometric
conversions, V
REFH
should be at the same potential as the supply
voltage being used by the analog signal being measured and referenced
to V
SS
.
9.3.2 Reference Voltage (V
REFH
)
The reference supply for the A/D converter shares pin PC7 with port C.
The low reference is tied to the V
SS
pin internally. V
REFH
can be any
voltage between V
SS
and V
DD
; however, the accuracy of conversions is
tested and guaranteed only for V
REFH
= V
DD
.
9.3.3 Accuracy and Precision
The 8-bit conversion result is accurate to within
±
1 1/2 LSB, including
quantization; however, the accuracy of conversions is tested and
guaranteed only with external oscillator operation.
9.4 Conversion Process
The A/D reference inputs are applied to a precision digital-to-analog
converter. Control logic drives the D/A and the analog output is
successively compared to the selected analog input which was sampled
at the beginning of the conversion cycle. The conversion process is
monotonic and has no missing codes.
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