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AT89S8253-24PC Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT89S8253-24PC Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 59 page 6 3286L–MICRO–8/08 AT89S8253 3.13 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 when 12-volt programming is selected. 3.14 XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit. 3.15 XTAL2 Output from the inverting oscillator amplifier. 4. Block Diagram PORT 2 DRIVERS PORT 2 LATCH P2.0 - P2.7 FLASH PORT 0 LATCH RAM EEPROM PROGRAM ADDRESS REGISTER BUFFER PC INCREMENTER PROGRAM COUNTER DUAL DPTR INSTRUCTION REGISTER B REGISTER INTERRUPT, SERIAL PORT, AND TIMER BLOCKS STACK POINTER ACC TMP2 TMP1 ALU PSW TIMING AND CONTROL PORT 1 DRIVERS P1.0 - P1.7 PORT 3 LATCH PORT 3 DRIVERS P3.0 - P3.7 OSC GND V CC PSEN ALE/PROG EA / V PP RST RAM ADDR. REGISTER PORT 0 DRIVERS P0.0 - P0.7 PORT 1 LATCH WATCH DOG SPI PORT PROGRAM LOGIC |
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