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参数资料
| 型号： | ADC0802 |
| 厂商： | Intersil Corporation |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-Bit, Microprocessor- Compatible, A/D Converters |
| 中文描述： | 8位微处理器兼容，A / D转换 |
| 文件页数： | 27/41页 |
| 文件大小： | 1118K |
| 代理商： | ADC0802 |
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Functional Description
(Continued)
Note 18:
The stack pointer must be dimensioned because a RST 7 instruction pushes the PC onto the stack.
Note 19:
All address used were arbitrarily chosen.
The standard control bus signals of the 8080 CS, RD and
WR) can be directly wired to the digital control inputs of the
A/D and the bus timing requirements are met to allow both
starting the converter and outputting the data onto the data
bus. A bus driver should be used for larger microprocessor
systems where the data bus leaves the PC board and/or
must drive capacitive loads larger than 100 pF.
4.1.1 Sample 8080A CPU Interfacing Circuitry and
Program
The following sample program and associated hardware
shown in Figure 12 may be used to input data from the con-
verter to the INS8080A CPU chip set (comprised of the
INS8080A microprocessor, the INS8228 system controller
and the INS8224 clock generator). For simplicity, the A/D is
controlled as an I/O device, specifically an 8-bit bi-directional
port located at an arbitrarily chosen port address, E0. The
TRI-STATE output capability of the A/D eliminates the need
for a peripheral interface device, however address decoding
is still required to generate the appropriate CS for the con-
verter.
It is important to note that in systems where the A/D con-
verter is 1-of-8 or less I/O mapped devices, no address de-
coding circuitry is necessary. Each of the 8 address bits (A0
to A7) can be directly used as CS inputs— one for each I/O
device.
4.1.2 INS8048 Interface
The INS8048 interface technique with the ADC0801 series
(see Figure 13) is simpler than the 8080A CPU interface.
There are 24 I/O lines and three test input lines in the 8048.
With these extra I/O lines available, one of the I/O lines (bit
0 of port 1) is used as the chip select signal to the A/D, thus
eliminating the use of an external address decoder. Bus con-
trol signals RD, WR and INT of the 8048 are tied directly to
the A/D. The 16 converted data words are stored at on-chip
RAM locations from 20 to 2F (Hex). The RD and WR signals
are generated by reading from and writing into a dummy ad-
dress, respectively. A sample interface program is shown
below.
SAMPLE PROGRAM FOR
Figure 12
ADC0801–INS8080A CPU INTERFACE
DS005671-99
A
www.national.com
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| ADC0802LCD | 8-Bit, Microprocessor- Compatible, A/D Converters |
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| ADC0802LD | 8-Bit, Microprocessor- Compatible, A/D Converters |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADC0802LCD | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:8-Bit, Microprocessor- Compatible, A/D Converters |
| ADC0802LCD/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0802LCJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit uP Compatible A/D Converters |
| ADC0802LCJ/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0802LCN | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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