Zilog Z51F3221

The Zilog Z51F3221 is an 8051 compatible MCU up to 16 MHz, with 2 Datapointers, 32 KByte On-Chip Flash ROM, 256 Bytes RAM, 1KByte Bytes XRAM (27 Bytes including LCD display RAM), 23 interrupts with 4 priority levels and 6 priority groups , 12-Bit ADC unit up to 8-Channels, 8-Bit Buzzer unit with 1 channel, Low voltage indicator for 13 different levels, Low voltage reset unit for 14 different levels, 1 UART, up to 9 ports, 1 SIO (Serial Input/Output unit), Up to 70 I/O, Bronw-Out detector, LCD Driver for 34 Segments and 8 common terminals, 4 Timer units with PWM functionality, 1 8-Bit Watchdog Timer (WDT), 1 Watch Timer (WT), 1 8-Bit Basic Interval Timer (BIT), On-Chip 16MHz oscillator, 125KHz Oscillator, and On-Chip debugger.