The CY7C63742/CY7C63743? enCoRe? USB Combination Low-Speed USB & PS/2 Peripheral Controller

The CY7C63722/23 and CY7C63742/43 are 8-bit RISC One Time Programmable (OTP) microcontrollers. The instruction set has
been optimized specifically for USB and PS/2 operations, although the microcontrollers can be used for a variety of other embedded
applications.
The CY7C637xx features up to 16 general purpose I/O (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 5% accurate 6-MHz clock source. 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 is offered with two EPROM options to maximize flexibility and minimize cost. The CY7C637x2 has 6 Kbytes of
EPROM. The CY7C637x3 has 8 Kbytes of EPROM. All versions have 256 bytes of data RAM for stack space, user variables, and
USB FIFOs.