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CY7C6431X Datasheet(PDF) 4 Page - Cypress Semiconductor |
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CY7C6431X Datasheet(HTML) 4 Page - Cypress Semiconductor |
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4 / 37 page  CY7C6431x CY7C6434x, CY7C6435x Document Number: 001-12394 Rev. *M Page 4 of 37 Firmware is required to handle various parts of the USB interface. The SIE issues interrupts after key USB events to direct firmware to appropriate tasks: ■ Fill and empty the USB data buffers in USB SRAM. ■ Enable PMA channels appropriately. ■ Coordinate enumeration by decoding USB device requests. ■ Suspend and resume coordination. ■ Verify and select data toggle values. 10-bit ADC The ADC on enCoRe V device is an independent block with a state machine interface to control accesses to the block. The ADC is housed together with the temperature sensor core and can be connected to this or the Analog mux bus. As a default operation, the ADC is connected to the temperature sensor diodes to give digital values of the temperature. Figure 2. ADC System Performance Block Diagram The ADC User Module contains an integrator block and one comparator with positive and negative input set by the MUXes. The input to the integrator stage comes from the analog global input mux or the temperature sensor with an input voltage range of 0 V to VREFADC. In the ADC only configuration (the ADC MUX selects the Analog mux bus, not the default temperature sensor connection), an external voltage can be connected to the input of the modulator for voltage conversion. The ADC is run for a number of cycles set by the timer, depending upon the desired resolution of the ADC. A counter counts the number of trips by the comparator, which is proportional to the input voltage. The Temp Sensor block clock speed is 36 MHz and is divided down to 1 to 12 MHz for ADC operation. SPI The serial peripheral interconnect (SPI) 3-wire protocol uses both edges of the clock to enable synchronous communication without the need for stringent setup and hold requirements. Figure 3. Basic SPI Configuration A device can be a master or slave. A master outputs clock and data to the slave device and inputs slave data. A slave device inputs clock and data from the master device and outputs data for input to the master. Together, the master and slave are essen- tially a circular Shift register, where the master generates the clocking and initiates data transfers. A basic data transfer occurs when the master sends eight bits of data, along with eight clocks. In any transfer, both master and slave transmit and receive simultaneously. If the master only sends data, the received data from the slave is ignored. If the master wishes to receive data from the slave, the master must send dummy bytes to generate the clocking for the slave to send data back. Figure 4. SPI Block Diagram INTERFACE BLOCK COMMAND/ STATUS ADC TEMP DIODES VIN SYSTEM BUS TEMP SENSOR/ ADC Interface to the M8 C ( Processor ) Core SPI Master SPI Slave MOSI MISO SCLK Data is output by both the Master and Slave on one edge of the clock. Data is registered at the input of both devices on the opposite edge of the clock. SPI Block Registers SYSCLK DATA_OUT DATA_IN CLK_IN CLK_OUT INT SS_ SCLK MOSI, MISO SCLK MOSI, MISO CONFIGURATION[7:0] CONTROL[7:0] TRANSMIT[7:0] RECEIVE[7:0] [+] Feedback |
Similar Part No. - CY7C6431X_11 |
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Similar Description - CY7C6431X_11 |
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