VCC Supply voltage VSS Circuit ground VSS1 Secondary ground (not on DIP) Provided to reduce ground bounce and improve power supply by-passing NOTE This pin is not a substitute for the VSS pin (pin 22) (Connection not necessary for proper operation ) Port 0 Port 0 is an 8-bit open drain bidirectiona
Features
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8XC52 54 58 CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Commercial Express 87C52 80C52 80C32 87C54 80C54 87C58 80C58
See Table 1 for Proliferation Options
Y
High Performance CHMOS EPROM ROM CPU 12 24 33 MHz Operations Three 16-Bit Timer Counters Programmable Clock Out 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
6 Interrupt Sources Programmable Serial Channel with Framing Error Detection Automatic Address Recognition TTL and CMOS Compatible Logic Levels 64K External Program Memory Space 64K External Data Memory Space MCS 51 Microcontroller Compatible Instruction Set Power Saving Idle and Power Down Modes ONCE (On-Circuit Emulatio
80C52 Datasheet
