Transcription of Programmable Serial Channel 8-bit Microcontroller
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Programmable Serial Channel 8-bit Microcontroller
1 Features Compatible with MCS-51 Products 8K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Programmable Serial Channel Low-power Idle and Power-down ModesDescriptionThe AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8 Kbytes of Flash Programmable and erasable read only memory (PEROM). The deviceis manufactured using Atmel s high-density nonvolatile memory technology and iscompatible with the industry-standard 80C51 and 80C52 instruction set and on-chip Flash allows the program memory to be reprogrammed in-system or by aconventional nonvolatile memory programmer.
effect if the microcontroller is in external execution mode. PSEN Program Store Enable is the read strobe to external pro-gram memory. When the AT89C52 is executing code from external pro-gram memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. EA/VPP
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