Integrated Circuits (IC)

• 8051 Central Processing Unit

– 4k × 8 ROM (80C51) – 128 × 8 RAM – Three 16-bit counter/timers – Full duplex serial channel – Boolean processor – Full static operation – Low voltage (2.7V to 5.5V@ 16MHz) operation

• Memory addressing capability

– 64k ROM and 64k RAM

• Power control modes:

– Clock can be stopped and resumed – Idle mode – Power-down mode

• CMOS and TTL compatible
• Three speed ranges at VCC = 5V

– 0 to 16MHz – 0 to 33MHz

• Three package styles
• Extended temperature ranges
• Dual Data Pointers
• Second DPTR register
• Security bits:

– ROM (2 bits) – OTP/EPROM (3 bits)

• Encryption array—64 bytes
• 4 level priority interrupt
• 6 interrupt sources
• Four 8-bit I/O ports
• Full–duplex enhanced UART

– Framing error detection – Automatic address recognition

• Programmable clock out
• Asynchronous port reset
• Low EMI (inhibit ALE)
• Wake-up from Power Down by an external interrupt (8XC51)