Advance Information

? Enhanced 8-bit C500 CPU

– Full software/toolset compatible to standard 80C51/80C52 microcontrollers

? 12 MHz external operating frequency

– 500 ns instruction cycle

? Built-in PLL for USB synchronization

? On-chip OTP program memory

– C540U : 4K byte

– C541U : 8K byte

– Alternatively up to 64K byte external program memory

– Optional memory protection

? On-chip USB module

– Compliant to USB specification

– Full speed or low speed operation

– Five endpoints : one bidirectional control endpoint four versatile programmable endpoints

– Registers are located in special function register area

– On-chip USB transceiver

Features:

? Up to 64K byte external data memory

? 256 byte on-chip RAM

? Four parallel I/O ports

– P-LCC-44 package : three 8-bit ports and one 6-bit port

– P-SDIP-52 package : four 8-bit ports

– LED current drive capability for 3 pins (10 mA)

? Two 16-bit timer/counters (C501 compatible)

? SSC synchronous serial interface (SPI compatible) (only C541U)

– Master and slave capable

– Programmable clock polarity / clock-edge to data phase relation

– LSB/MSB first selectable

– 1.5 MBaud transfer rate at 12 MHz operating frequency

? 7 interrupt sources (2 external, 5 internal with 2 USB interrupts) selectable at 2 priority levels

? Enhanced fail safe mechanisms

– Programmable watchdog timer (only C541U)

– Oscillator watchdog

? Power saving modes

– idle mode

– software power down mode with wake-up capability through INT0 pin or USB

? On-chip emulation support logic (Enhanced Hooks Technology TM)

? P-LCC-44 and P-SDIP-52 packages

? Power supply voltage range : 4.0V to 5.5V

? Temperature Range : SAB-C540U TA = 0 to 70 °C

SAB-C541U T A = 0 to 70 °C