barcode reader code in asp.net c# The system is set up through the SIM setup registers in Software

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Queued Serial Module (QSM)
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The QSM contains a serial communications interface (SCI) and a queued serial port interface (QSPI) module The queuing feature of the QSPI bus, and its associated chip selects, enhances the overall performance of the processors Memory
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Boot Memory
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Single-chip processors contain their own ash boot memory Alternatively, expanded mode processors support external boot memory, which may be a variety of technologies, including EPROM, EEPROM, or NOVRAM (non-volatile RAM) Because they are connected to the boot chip select on the processor, they must contain the boot program to set up the processor control registers The remaining memory in the parts may be used for any of a number of purposes (program, parameter storage, data logging, etc)
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Up to 1 Mbyte of RAM is supported by a typical processor This should provide suf cient RAM to facilitate data logging and parameter storage
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Processors control peripheral chips via programmable chip selects, which allow the user to change the memory map through control registers The memory map is therefore not xed until initialization has taken place On power-up, the boot chip select is set to be active in the address range $000000 to $100000 After power-up,
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the chip selects can be set to create any desired memory map within the limits set by the hardware design
Chip Select
Examples of such chip selects are CSBOOT and CS0 to CS10 CSBOOT is always a chip select since it must be used before the registers are con gured CS0 to CS10 may be used for a variety of functions as they are programmable The hardware con guration of the board uses some of these chip selects for speci c purposes The Table 148 shows a typical use of the chip selects
Table 148 Chip select allocation CSBOOT CS0 CS1 CS2 CS3 CS4 CS5 CS6 CS7 CS8 CS9 CS910 Boot memory select This chip select is combined with other signals in a PAL to produce chip selects for the boot memories RAM select Enable signal buffering and conditioning circuit ADC enable CAN serial interface IC Output driver module enable Transmission controller enable Memory control Spare Spare Spare Spare
Analog-to-Digital Converters
The system includes 10-bit and 8-bit ADCs Both of these converters communicate with the processor via the QSPI bus There is a low-pass RC lter on each of the ADC channels
Communications
Several different types of serial communications are available on microprocessor chips Some examples are: SCI, QSPI, Class II, CAN, and RS-2329 All interfaces are made available to the user at the interface connector The SCI has both TXD (digital transmit) and RXD (digital receive) lines The SCI lines are available at the interface connector directly and are routed to a level shifter circuit to provide the appropriate signal levels Class II is a single-wire serial bus for communication between microprocessor-controlled modules The bus allows any module to communicate with any other module on the bus A data link controller IC is used as an interface between the processor and the bus CAN is a European-standard, high-speed communications link using a twowire interface The controller communicates with the CAN controller over the parallel bus Serial lines are found on the interface connectors
9 See
15 for an introduction to the RS-232 communication protocol
14
Digital Systems
Interrupts
Many microprocessors have several interrupt input lines which, when set, will interrupt the software process being executed in favor of a new process Some of these interrupt request lines may be software-maskable, such that their effect is ignored, while others may be nonmaskable, indicating that the processor will always service a request seen on these inputs Each interrupt line will be prioritized to ensure an orderly process in the event that the processor receives more than one interrupt request The nonmaskable interrupts will be ranked with the highest priority Unused interrupt lines may be left disconnected, while a software fault routine may be serviced in the event the microprocessor experiences an input on one of these unused inputs
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