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AT89LS51-16JI Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT89LS51-16JI Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 32 page 6 3053B–MICRO–3/05 AT89LS51 4.10 EA/VPP External Access Enable. EA must be strapped to GND in order to enable the device to fetch code from external program memory locations starting at 0000H up to FFFFH. Note, however, that if lock bit 1 is programmed, EA will be internally latched on reset. EA should be strapped to V CC for internal program executions. This pin also receives the 12-volt programming enable voltage (V PP) during Flash programming. 4.11 XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit. 4.12 XTAL2 Output from the inverting oscillator amplifier 5. Special Function Registers A map of the on-chip memory area called the Special Function Register (SFR) space is shown in Table 5-1. Note that not all of the addresses are occupied, and unoccupied addresses may not be imple- mented on the chip. Read accesses to these addresses will in general return random data, and write accesses will have an indeterminate effect. |
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