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P80C32X2BA Datasheet(PDF) 11 Page - NXP Semiconductors |
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P80C32X2BA Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 62 page Philips Semiconductors Product data P80C3xX2; P80C5xX2; P87C5xX2 80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) 2003 Jan 24 11 PIN NUMBER MNEMONIC NAME AND FUNCTION TYPE TSSOP LQFP PLCC DIP PSEN 29 32 26 18 O Program Store Enable: The read strobe to external program memory. When the device is 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 20 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 0000H to 0FFFH/1FFFH/3FFFH/7FFFH. If EA is held high, the device executes from internal program memory unless the program counter contains an address greater than the on-chip ROM/OTP. 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 8 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL2 18 20 14 7 O Crystal 2: Output from the inverting oscillator amplifier. NOTES: 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. 1. Absent in the TSSOP38 package. |
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