CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
ROM-less Version for 90C52

FEATUREs
• Fully compatible to standard MCS-51 microcontroller
• Versions for 40/50 MHz operating frequency
• Low voltage version for 24MHz operating frequency
• 256 bytes of on-chip data RAM
• 64K external program memory space
• 64K external data memory space
• Four 8-bit ports
• Three 16-bit Timers/Counters (Timer 2 with up/down counter feature)
• USART
• Six interrupt sources, two priority levels
• Power saving Idle and power down mode
• 2.7Volt low voltage version available
• P-DIP-40, P-LCC-44, P-MQFP-44 package