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P87C51RA+4B Datasheet(PDF) 6 Page - NXP Semiconductors |
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P87C51RA+4B Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 56 page Philips Semiconductors Product specification 8XC54/58 8XC51FA/FB/FC/80C51FA 8XC51RA+/RB+/RC+/RD+/80C51RA+ 80C51 8-bit microcontroller family 8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V), low power, high speed (33 MHz) 2000 Aug 07 6 PIN DESCRIPTIONS (Continued) PIN NUMBER MNEMONIC DIP LCC QFP TYPE NAME AND FUNCTION PSEN 29 32 26 O Program Store Enable: The read strobe to external program memory. When executing code from the external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. PSEN is not activated during fetches from internal program memory. EA/VPP 31 35 29 I External Access Enable/Programming Supply Voltage: EA must be externally held low to enable the device to fetch code from external program memory locations starting with 0000H. If EA is held high, the device executes from internal program memory unless the program counter contains an address greater than 8k Devices (IFFFH), 16k Devices (3FFFH) or 32k Devices (7FFFH). Since the RD+ has 64k Internal Memory, the RD+ will execute only from internal memory when EA is held high. This pin also receives the 12.75 V programming supply voltage (VPP) during EPROM programming. If security bit 1 is programmed, EA will be internally latched on Reset. XTAL1 19 21 15 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL2 18 20 14 O Crystal 2: Output from the inverting oscillator amplifier. NOTE: To avoid “latch-up” effect at power-on, the voltage on any pin at any time must not be higher than VCC + 0.5 V or VSS – 0.5 V, respectively. |
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