87C51/80C51BH/80C31BH CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER Commercial/Express 87C51/80C51BH/80C51BHP/80C31BH *See Table 1 for Proliferation Options ■ ■ ■ 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 (- 40°C to + 85 ° C) ■ ■ ■ 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 ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ MEMORY ORGANIZATION PROGRAM MEMOR...

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