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參數(shù)資料
| 型號： | C517 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit CMOS MICROCONTROLLER |
| 中文描述： | 8位CMOS單片機 |
| 文件頁數(shù)： | 30/72頁 |
| 文件大小： | 845K |
| 代理商： | C517 |
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C517A
Semiconductor Group
28
Digital I/O Ports
The C517A allows for digital I/O on 56 lines grouped into 7 bidirectional 8-bit ports. Each port bit
consists of a latch, an output driver and an input buffer. Read and write accesses to the I/O ports P0
through P6 are performed via their corresponding special function registers P0 to P6.
The output drivers of port 0 and 2 and the input buffers of port 0 are also used for accessing external
memory. In this application, port 0 outputs the low byte of the external memory address, time-
multiplexed with the byte being written or read. Port 2 outputs the high byte of the external memory
address when the address is 16 bits wide. Otherwise, the port 2 pins continue emitting the P2 SFR
contents.
Analog Input Ports
Ports 7 (8-bit) and 8 (4-bit) are input ports only and provide two functions. When used as digital
inputs, the corresponding SFR P7 and P8 contains the digital value applied to the port 7/8 lines.
When used for analog inputs the desired analog channel is selected by a four-bit field in SFR
ADCON1. Of course, it makes no sense to output a value to these input-only ports by writing to the
SFR P7 or P8. This will have no effect.
lf a digital value is to be read, the voltage levels are to be held within the input voltage specifications
(
V
IL
/
V
IH
). Since P7 and P8 are not bit-addressable, all input lines of P7 and P8 are read at the same
time by byte instructions.
Nevertheless, it is possible to use port 7 and 8 simultaneously for analog and digital input. However,
care must be taken that all bits of P7 and P8 that have an undetermined value caused by their
analog function are masked.
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相關代理商/技術參數(shù) |
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| C5174G | 制造商:POWERBOX 制造商全稱:Powerbox 功能描述:5000 WATTS (AC) DC/D CSINGLE OUTPUT |
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