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TS80C58X2 Scheda tecnica(PDF) 7 Page - ATMEL Corporation |
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TS80C58X2 Scheda tecnica(HTML) 7 Page - ATMEL Corporation |
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7 / 62 page  7 4431E–8051–04/06 AT/TS8xC54/8X2 MNEMONIC PIN NUMBER TYPE NAME AND FUNCTION ALE/PROG 30 33 27 O (I) Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the address during an access to external memory. In normal operation, ALE is emitted at a constant rate of 1/6 (1/3 in X2 mode) the oscillator frequency, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. This pin is also the program pulse input (PROG) during EPROM programming. ALE can be disabled by setting SFR’s AUXR.0 bit. With this bit set, ALE will be inactive during internal fetches. 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/V PP 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 0000H and 3FFFH (54X2) or 7FFFH (58X2). If EA is held high, the device executes from internal program memory unless the program counter contains an address greater than 3FFFH (54X2) or 7FFFH (58X2). This pin also receives the 12.75V programming supply voltage (VPP) during EPROM programming. If security level 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 Table 5-1. Pin Description for 40/44 pin packages MNEMONIC PIN NUMBER TYPE Name And Function DIL LCC VQFP 1.4 |
Codice articolo simile - TS80C58X2_14 |
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Descrizione simile - TS80C58X2_14 |
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