GENERAL DESCRIPTION
The P8xC591 is a single-chip 8-bit-high-performance microcontroller, with on-chip CAN-controller, derived from the 80C51 microcontroller family.
It uses the powerful 80C51 instruction set and includes the successful PeliCAN functionality of the SJA1000 CAN controller from Philips Semiconductors.

FEATURES
80C51 Related Features of the 8xC591
• Full static 80C51 Central Processing Unit available as OTP, ROM and ROMless
• 16 Kbytes internal Program Memory expandable externally to 64 Kbytes
• 512 bytes on-chip Data RAM expandable externally to 64 Kbytes
• Three 16-bit timers/counters T0, T1 (standard 80C51) and additional T2 (capture & compare)
• 10-bit ADC with 6 multiplexed analog inputs with fast 8-bit ADC option
• Two 8-bit resolution, Pulse Width Modulated outputs
• 32 I/O port pins in the standard 80C51 pinout
• I2C-bus serial I/O port with byte oriented master and slave functions
• On-chip Watchdog Timer T3
• Extended temperature range: −40 to +85°C
• Accelerated (prescaler 1:1) instruction cycle time 500 ns @ 12 MHz
• Operation voltage range: 5 V ± 5%
• Security bits:
    – ROM version has 2 bits
    – OTP/EPROM version has 3 bits
• 32 bytes Encryption array
• 4 level priority interrupt, 15 interrupt sources
• Full-duplex enhanced UART with programmable Baudrate Generator
• Power Control Modes:
    – Clock can be stopped and resumed
    – Idle Mode
    – Power-down Mode
• ADC active in Idle Mode
• Second DPTR register
• ALE inhibit for EMI reduction
• Programmable I/O port pins (pseudo bi-directional, push-pull, high impedance, open drain)
• Wake-up from Power-down by external interrupts
• Software reset bit (AUXR1.5)
• Low active reset pin
• Power-on detect reset
• Once mode