ATMEL 89C55 PDF

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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WR external data memory write strobe. EA should be strapped to V.

Atmel AT89C55

As inputs, Port 2 pins that are externally being pulled low will source current I. As inputs, Port 3 pins that are externally being pulled low will source current I.

The on-chip Flash allows the program memory to be atmrl in-system or by a conventional nonvolatile memory programmer. As an output port, each pin can sink eight TTL inputs.

89C55 Datasheet(PDF) – ATMEL Corporation

When 1s are written to Port 2 pins, they are pulled high by the internal pullups and can be used as inputs. When 1s are written to Port 3 pins, they are pulled high by the internal pullups and can be used as inputs. A high on this pin for two machine cycles while the oscillator is running resets the device.

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The AT89C55 provides the following standard features: Port 0 also receives the code bytes during Flash program- ming and outputs the code bytes during program verifica- tion. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C55 is a ztmel microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.

Interrupt Registers The individual interrupt enable bits are in the IE register. INT1 external interrupt 1.

Otherwise, the pin is weakly pulled high. Port 3 also receives the highest-order address bit and some control signals for Flash programming and verifica- tion.

Two priorities can be set for each of the six interrupt sources in the IP register. The Power Down Mode saves the RAM con- tents but freezes the oscillator, disabling all other chip func- tions until the next hardware reset. RD external data memory read strobe.

Note, however, that one ALE pulse is skipped during each access to external data mem- ory. Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode.

INT0 external interrupt 0. Note that stack operations are examples of indirect addressing, so the upper bytes of data RAM are avail- able atmek stack space.

User software should 89f55 write 1s to these unlisted loca- tions, since they may be used in future products to invoke new features. Note, however, that if lock bit 1 is programmed, EA will be internally latched on reset.

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At89c55-24jc Atmel IC Microcontroller 8-bit 44 Pin PLCC MCU 89c55-24jc

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. Port 2 also receives the high-order address bits and some control signals during Flash programming and verification. RXD serial input port. The low-voltage 89f55 saves power and operates with a 2. In addition, the AT89C55 is designed with static logic for operation down to zero frequency and sup- ports two software selectable power saving modes.

XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit.

T1 timer 1 external input. As inputs, Port 1 pins that are externally being pulled low will source current I. 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.

Instructions that use direct addressing access SFR space. In that case, the reset or inactive values of the new bits will always be 0.