87C51 80C51BH 80C31BH CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER Commercial Express 87C51 80C51BH 80C51BHP 80C31BH See Table 1 for Proliferation Options Y Y Y High Performance CHMOS EPROM 24 MHz Operation Improved Quick-Pulse Programming Algorithm 3-Level Program Memory Lock Boolean Processor 128-Byte Data RAM 32 Programmable I O Lines Two 16-Bit Timer Counters Extended Temperature Range ( b 40 C to a 85 C) Y Y Y 5 Interrupt Sources Programmable Serial Port TTL- and CMOS-Compatible Logic Levels 64K External Program Memory Space 64K External Data Memory Space ONCE Mode Facilitates System Testing Power Control Modes Idle Power Down Y Y Y Y Y Y Y Y Y Y MEMORY ORGANIZATION PROGRAM MEMORY Up t...

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