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CY7C63743-PXC Datasheet(PDF) 2 Page - Cypress Semiconductor |
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CY7C63743-PXC Datasheet(HTML) 2 Page - Cypress Semiconductor |
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2 / 49 page  CY7C63722 CY7C63723 CY7C63743 FOR FOR Document #: 38-08022 Rev. *B Page 2 of 49 2.0 Logic Block Diagram 3.0 Functional Overview 3.1 enCoRe USB—The New USB Standard Cypress has reinvented its leadership position in the low-speed USB market with a new family of innovative microcontrollers. Introducing...enCoRe USB—“enhanced Component Reduction.” Cypress has leveraged its design expertise in USB solutions to create a new family of low-speed USB microcontrollers that enables peripheral developers to design new products with a minimum number of components. At the heart of the enCoRe USB technology is the break- through design of a crystalless oscillator. By integrating the oscillator into our chip, an external crystal or resonator is no longer needed. We have also integrated other external compo- nents commonly found in low-speed USB applications such as pull-up resistors, wake-up circuitry, and a 3.3V regulator. All of this adds up to a lower system cost. The CY7C637xx is an 8-bit RISC one-time-programmable (OTP) microcontroller. The instruction set has been optimized specifically for USB and PS/2 operations, although the micro- controllers can be used for a variety of other embedded appli- cations. The CY7C637xx features up to 16 GPIO pins to support USB, PS/2 and other applications. The I/O pins are grouped into two ports (Port 0 to 1) where each pin can be individually configured as inputs with internal pull-ups, open drain outputs, or traditional CMOS outputs with programmable drive strength of up to 50 mA output drive. Additionally, each I/O pin can be used to generate a GPIO interrupt to the microcontroller. Note the GPIO interrupts all share the same “GPIO” interrupt vector. The CY7C637xx microcontrollers feature an internal oscillator. With the presence of USB traffic, the internal oscillator can be set to precisely tune to USB timing requirements (6 MHz ±1.5%). Optionally, an external 6-MHz ceramic resonator can be used to provide a higher precision reference for USB operation. This clock generator reduces the clock-related noise emissions (EMI). The clock generator provides the 6- and 12-MHz clocks that remain internal to the microcontroller. The CY7C637xx has 8 Kbytes of EPROM and 256 bytes of data RAM for stack space, user variables, and USB FIFOs. These parts include low-voltage reset logic, a Watchdog timer, a vectored interrupt controller, a 12-bit free-running timer, and capture timers. The low-voltage reset (LVR) logic detects when power is applied to the device, resets the logic to a known state, and begins executing instructions at EPROM address 0x0000. LVR will also reset the part when VCC drops below the operating voltage range. The Watchdog timer can be used to ensure the firmware never gets stalled for more than approximately 8 ms. The microcontroller supports 10 maskable interrupts in the vectored interrupt controller. Interrupt sources include the USB Bus-Reset, the 128- µs and 1.024-ms outputs from the free-running timer, three USB endpoints, two capture timers, an internal wake-up timer and the GPIO ports. The timers bits cause periodic interrupts when enabled. The USB endpoints interrupt after USB transactions complete on the bus. The capture timers interrupt whenever a new timer value is saved due to a selected GPIO edge event. The GPIO ports have a level of masking to select which GPIO inputs can cause a GPIO interrupt. For additional flexibility, the input transition polarity that causes an interrupt is programmable for each GPIO pin. The interrupt polarity can be either rising or falling edge. The free-running 12-bit timer clocked at 1 MHz provides two interrupt sources as noted above (128 µs and 1.024 ms). The timer can be used to measure the duration of an event under firmware control by reading the timer at the start and end of an Wake-Up 12-bit Timer USB & D+,D– P1.0–P1.7 Interrupt Controller Port 0 P0.0–P0.7 GPIO 8-bit RISC Xtal RAM 256 Byte EPROM 8K Byte Core Brown-out Reset Xcvr Watch Timer Dog 3.3V Port 1 GPIO Capture Timers USB Engine PS/2 Internal Oscillator Oscillator Low Reset Voltage Regulator Timer SPI XTALOUT XTALIN/P2.1 VREG/P2.0 |
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