0 – July. 1. Qualification Package. AT89C51ED2. FLASH 8-bit C51 Microcontroller. 64 Kbytes FLASH, 2 Kbytes EEPROM. AT89C51RD2 / AT89C51ED2. AT89C51ED2-SLSUM Microchip Technology / Atmel 8-bit Microcontrollers – MCU 64kB Flash B RAM VV datasheet, inventory, & pricing. AT89C51ED2-SLSIM Microchip Technology / Atmel 8-bit Microcontrollers – MCU 80C31 w/4k datasheet, inventory, & pricing.
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Must be cleared by software. It is driven by the Master for eight clock cycles which allows to exchange one Byte on the serial lines. Set by hardware to indicate that the SS pin is at inappropriate logic level.
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During the time that execution resumes, the internal RAM cannot be accessed; however, it is possible for the Port pins to be accessed.
Only one Master SPI device can initiate transmissions.
Page 42 Table Page 66 Figure VIH min changed from 0. The Kbytes Dataeheet memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. A cold start reset is the one induced by VCC switch-on. Set to program PCA to be gated off during idle.
Note that one ALE pulse is skipped during each access to external data memory. Its advantages include reduced software overhead and improved accuracy.
It contains a Kbyte At89c551ed2 memory block for code and for data. Added Flash write programming time specification. A default serial loader bootloader program allows ISP of the Flash. Set to enable a high level detection on Port line 6.
Page 56 Table To communicate with slaves B and C, but not slave A, the master must send an address with bits 0 datqsheet 1 both set e. Page 58 Table Page 82 continue for a number of clock cycles before the internal reset algorithm takes control. Set to enable SPI interrupt. This can be useful if external peripherals are mapped at addresses already used by the internal XRAM. The four segments are: Page 6 Table Page 78 Table Pins are not guaranteed to sink current greater than the listed test conditions.
Symbol Description Symbol Table S2 0 0 0 0 1 1 1 1 S1 S0Selected Time-out 00 – dataxheet machine cycles, These interrupts are shown at89c15ed2 Figure This is achieved by applying an internal reset to them.
Page 12 Table Page 74 Table Set by user for general purpose usage. Cleared by hardware when programming is done. The command “Program Software Security Bit” can only write a higher priority level.
If the program counter ever goes astray, a match will eventually occur and cause an internal reset. An internal counter will count clock periods before the reset is de-asserted.
Page 52 Table Page 38 Table It is possible to use Timer 2 as a baud rate generator and at89c51er2 clock generator simultaneously. Thus, in most applications the first solution is the best option.
MICROCHIP TECHNOLOGY AT89C51ED2-SLRUM : Datasheet
Page 50 Slave C: It provides both synchronous and asynchronous communication modes. These modes are detailed in the following sections. Page 18 Figure The following is a list of all the characters and what they stand for. Page 8 Table Cleared to select 6 clock periods per peripheral clock cycle. This output type can be used as both an input and output without the need to reconfigure the port. Security level 2 and 3 should only be programmed after Flash verification. Save and disable interrupts.
When the pin is pulled low, it is driven strongly and able to sink a fairly large current. This page, called “Extra Flash Memory”, is not in the internal Flash program memory addressing space. MODF is set to warn that there may be a multimaster conflict for system control.
From level 0, one can write level 1 or level 2.