Text from website Sunplus 03-01-2007

SPCP835A
USB to Serial/Parallel port Controller

General Description 
The SPCP835A is a cost effective solution that used as a bridge to communicate the data between a USB port and a UART interface at the baud rate up to 6M bps. The wide output voltage range of the I/Os allows the SPCP835A to be used at various applications such as mobile phones, PDAs and many other devices which want to upload/download data to/from the PC. The build-in 10.5K OTP ROM allows the user to program the USB protocol flexibly and change the Vendor ID, product ID easily, without the need of a external EEPROM.
   
Features
-A cost effective solution to support USB to UART / USB to SPI applications.
-Use 6 MHZ crystal or resonator, with build-in 30pF capacitor from XI to ground and 15pF capacitor from XO to ground, so the external capacitors for the crystal or resonator may be omitted.
-Operation Voltage : I/O: 2.7V ¡V 5.5V; Core: 4.0V ¡V 5.5v
-Built-in Sunplus 8 bit CPU core which can be running at up to 12 MHZ clock rate.
-Memory 
 -10.5 K bytes Program (One-Time-Programmable) memory
 -192 bytes RAM

-USB 
 -Conforms to USB 2.0 Full speed specifications
 -There are build-in 30pF capacitor from XI to ground and 15pF capacitor from XO to ground, so the external capacitors for the crystal or resonator may be omitted.
 -Support 4 end points; each endpoint can be programmed to be IN or OUT endpoint.

-I/O 
 -12 general purpose I/O pins
 -Programmable I/O direction and pull-up /pull-down enable/disable selection

-Parallel Interface with DMA 
 -8-bit parallel interface with DMA controller allows the EP1 and EP2 buffer can be accessed by external read/write command.
 -The max data rate of the parallel interface can be up to 1M byte/s

-UART 
 -Support Full-Duplex asynchronous serial communication.The max baud rate can be up to 3 M bps.
 -10-bit or 11-bit mode with parity control

-CRC generation 
 -CRC16 or CRC-CCITT
 -Hardware CRC generation circuit 

-Timer 
 -Timer0: 14-bit free-run timer, generates two interrupts: overflow IRQ (T0_Flag) and real time IRQ (RTI).
 -Timer1: Re-loadable 8-bit timer, can be cascaded to 16-bit timer. It is used exclusively by the UART when the UART is enabled.
 -Timer2: Re-loadable 8-bit timer, counting at USB frame rate 1 ms. 
-2 Input capture registers.
-Selectable edge trigger for capture input.
-Pulse or period measurement.
-Reset Circuit
-Low voltage Detection circuit
-Low voltage reset
-Watchdog Timer reset
-Software Reset