8XL52 Datasheet (Intel Corporation) - LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS

8XL52, LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS

VCC Supply voltage VSS Circuit ground Port 0 Port 0 is an 8-bit open drain bidirectional I O port As an output port each pin can sink several inputs Port 0 pins that have 1’s written to them float and in that state can be used as high-impedance inputs Port 0 is also the multiplexed low-order addres

8XL52 54 58 LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS Commercial Express 87L52 80L52 87L54 80L54 87L58 80L58 Y Y Y High Performance CHMOS OTP ROM Low Voltage Operation 20 MHz Commercial 16 MHz Express Operation Three 16-Bit Timer Counters Up Down Timer Counter Three Level Program Lock System 8K 16K 32K On-Chip Program Memory 256 Bytes of On-Chip Data RAM Improved Quick Pulse Programming Algorithm Boolean Processor 32 Programmable I O Lines Y Y Y 6 Interrupt Sources Four Level Inter

8XL52 Features

* of the MCS-51 Family as listed below Port Pin P3 0 P3 1 P3 2 P3 3 P3 4 P3 5 P3 6 P3 7 Alternate Function RXD (serial input port) TXD (serial output port) INT0 (external interrupt 0) INT1 (external interrupt 1) T0 (Timer 0 external input) T1 (Timer 1 external input) WR (external data memory write str