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89C58 Datasheet(PDF) 7 Page - NXP Semiconductors |
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89C58 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 32 page  Philips Semiconductors Product specification 89C51/89C52/89C54/89C58 80C51 8-bit microcontroller family 4K/8K/16K/32K Flash 1999 Oct 27 7 FLASH EPROM MEMORY General Description The 89C51/89C52/89C54/89C58 FLASH reliably stores memory contents even after 100 erase and program cycles. The cell is designed to optimize the erase and programming mechanisms. In addition, the combination of advanced tunnel oxide processing and low internal electric fields for erase and programming operations produces reliable cycling. Features • FLASH EPROM internal program memory with Chip Erase • Up to 64 k byte external program memory if the internal program memory is disabled (EA = 0) • Programmable security bits • 100 minimum erase/program cycles for each byte • 10 year minimum data retention • Programming support available from many popular vendors OSCILLATOR CHARACTERISTICS XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier. The pins can be configured for use as an on-chip oscillator. To drive the device from an external clock source, XTAL1 should be driven while XTAL2 is left unconnected. There are no requirements on the duty cycle of the external clock signal, because the input to the internal clock circuitry is through a divide-by-two flip-flop. However, minimum and maximum high and low times specified in the data sheet must be observed. RESET A reset is accomplished by holding the RST pin high for at least two machine cycles (24 oscillator periods), while the oscillator is running. To insure a good power-on reset, the RST pin must be high long enough to allow the oscillator time to start up (normally a few milliseconds) plus two machine cycles. At power-on, the voltage on VCC and RST must come up at the same time for a proper start-up. Ports 1, 2, and 3 will asynchronously be driven to their reset condition when a voltage above VIH1 (min.) is applied to RESET. The value on the EA pin is latched when RST is deasserted and has no further effect. |
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Similar Description - 89C58 |
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