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| 型号： | MC68HC05P9AP |
| 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, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 51/90页 |
| 文件大小： | 285K |
| 代理商： | MC68HC05P9AP |
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GENERAL RELEASE SPECIFICATION
MC68HC05P9A
ANALOG-TO-DIGITAL (A/D) CONVERTER
MOTOROLA
Rev. 2.0
10-1
SECTION 10
ANALOG-TO-DIGITAL (A/D) CONVERTER
This section describes the four-channel, 8-bit, multiplexed input, successive-
approximation A/D converter.
10.1
Conversion Process
The A/D conversion process is ratiometric, using two reference voltages, VRH and
VSS. Conversion accuracy is guaranteed only if VRH is equal to VDD.
A multiplexer selects one of four analog input channels (AN3, AN2, AN1, or AN0)
for sampling. A comparator successively compares the output of an internal
digital-to-analog (D/A) converter to the sampled analog input. Control logic
changes the D/A converter input one bit at a time, starting with the most
signicant bit (MSB), until the D/A converter output matches the sampled analog
input. The conversion is monotonic and has no missing codes.
An analog input voltage equal to VRH converts to digital $FF; an input voltage
greater than VRH converts to $FF with no overow. An analog input voltage equal
to VSS converts to digital $00. For ratiometric conversions, the source of each
analog input should use VRH as the supply voltage and be referenced to VSS.
Pins PC6–PC3 are the four inputs to the multiplexer. Each channel of conversion
takes 32 internal clock cycles, and the clock frequency must be equal to or greater
than 1 MHz. If the internal clock frequency is less than 1 MHz, the A/D internal RC
oscillator (nominally 1.5 MHz) must be used for the A/D conversion clock. Make
this selection by setting the ADRC bit in the A/D status and control register to
logical one.
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相关代理商/技术参数 |
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| MC68HC05P9DW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05P9P | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
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