參數(shù)資料
型號(hào)： Q67121-C1068
廠商： SIEMENS 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微控制器
文件頁(yè)數(shù)： 31/69頁(yè)
文件大?。?/td> 1124K
代理商： Q67121-C1068
Semiconductor Group
31
1997-07-01
C515C
Digital I/O Ports
The C515C allows for digital I/O on 49 lines grouped into 6 bidirectional 8-bit ports and one 1-bit
port. 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 P7 are performed via their corresponding special function registers P0
to P7. The port structure of port 5 of the C515C is especially designed to operate either as a quasi-
bidirectional port structure, compatible to the standard 8051-Family, or as a genuine bidirectional
port structure. This port operating mode can be selected by software (setting or clearing the bit
PMOD in the SFR SYSCON).
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 6 is available as input port only and provides two functions. When used as digital inputs, the
corresponding SFR P6 contains the digital value applied to the port 6 lines. When used for analog
inputs the desired analog channel is selected by a three-bit field in SFR ADCON0 or SFR ADCON1.
Of course, it makes no sense to output a value to these input-only ports by writing to the SFR P6.
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 P6 is not bit-addressable, all input lines of P6 are read at the same time by byte
instructions.
Nevertheless, it is possible to use port 6 simultaneously for analog and digital input. However, care
must be taken that all bits of P6 that have an undetermined value caused by their analog function
are masked.
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Q67121-C848 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:16-Bit CMOS Single-Chip Microcontroller
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