NXP Flash MCU to Atmel Flash MCU Cross Reference. 07/01/ 86KB. NXP Flash MCU to Atmel Flash MCU Devices, Non-Direct Replacements. 07/01/ The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard 80C51 instruction set and. 89C55 datasheet, 89C55 circuit, 89C55 data sheet: ATMEL – 8-Bit Microcontroller with 20K Bytes Flash,alldatasheet, datasheet, Datasheet search site for.

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Two priorities can be set for each of the six interrupt sources in the IP register. The low-voltage option saves power and operates with a 2.

At89cjc Atmel IC Microcontroller 8-bit 44 Pin PLCC MCU 89cjc | eBay

Port 3 also receives the highest-order address bit and some control signals for Flash programming and verifica- tion. TXD serial output port.

In this application, Port 2 uses strong internal pul- lups when emitting 1s. The upper bytes occupy a parallel address space to the Special Function Registers. EA should be strapped to V. When 1s are written to Port 3 pins, they are pulled high by the internal pullups and can be used as inputs. XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit.

In this mode, P0 has internal pul- lups. RXD serial input port. Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode. Port 0 also receives the code bytes during Flash program- ming and outputs the code bytes during program verifica- tion. Port 2 also receives the high-order address bits and some control signals during Flash programming and verification. Search field Part name Part description. When 1s are written to port 0 pins, the pins can be used as high- impedance inputs.


XTAL2 Output from the inverting oscillator amplifier. When 1s are written to Port 1 pins, they are pulled high by the internal pullups and can be used as inputs.

Port 1 also receives the low-order address bytes during Flash programming and verification. The device is manu- factured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard 80C51 instruction set and pinout.

As an output port, each pin can sink eight TTL inputs. T0 timer 0 external input. The Power Down Mode saves the RAM con- tents but freezes the oscillator, disabling all other chip func- tions 8c955 the next hardware reset. As inputs, Port 3 pins that are externally being pulled low will source current I. Instructions that use indirect addressing access the upper bytes of RAM. INT0 external interrupt 0. User software should not write 1s to these unlisted loca- tions, since they may be used in future products to invoke new ateml.

Note, however, that one ALE pulse is skipped during each access to external data mem- ory. Three-Level Program Memory Lock. In that case, the reset or 89c555 values of the new bits will always be 0.


The on-chip Flash allows the program memory to be atme in-system or by a conventional nonvolatile memory programmer. Port 3 also serves the functions of various special features of the AT89C55, as shown in the following table. Note that not all of the addresses are occupied, and unoc- cupied 8c55 may not be implemented on the chip.

Otherwise, the pin is weakly pulled high.

89C55 (ATMEL) – 8-bit Microcontroller With 20k Bytes Flash | eet

WR external data memory write strobe. Read accesses to these addresses will in general return random data, and write accesses will have an indetermi- nate effect. Instructions that use direct addressing access SFR space. By combining a versatile 8-bit 899c55 with Flash on a monolithic chip, the Atmel AT89C55 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications. This pin also receives the volt programming enable volt- age V.

For example, the following indirect addressing instruction, where R0 contains 0A0H, accesses the data byte at address 0A0H, rather than P2 whose address is 0A0H.

Atmel AT89C55

External pullups are required during program verifica- tion. T1 timer 1 external input. INT1 external interrupt 1.