The Atmel AT89C52 is an based Fullly Static 24MHz CMOS controller Allen Systems; AT89C52 Controller Board Data Sheet for the Atmel AT89C AT89C52 8-bit Microcontroller With 8k Bytes Flash Features. Compatible with MCSTM Products 8K Bytes of In-System Reprogrammable Flash Memory. AT89CPC Microchip Technology / Atmel 8-bit Microcontrollers – MCU 8K Flash 24M datasheet, inventory, & pricing.

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Three-level Program Memory Lock. Low-power Idle and Power-down Modes. The on-chip Flash allows the program memory to be reprogrammed in-system or by a. By combining a versatile 8-bit CPU. The AT89C52 provides the following standard features: When 1s are written to Port 2 pins, they are pulled high by. In addition, the AT89C52 is designed with static logic. Darasheet 2 pins that are externally being pulled low will source.

Port 2 emits the high-order address byte during fetches. The Power-down mode saves the RAM contents but. In this application, Port 2 uses strong internal pul. During accesses to external data. Port 2 also receives the datashewt address bits and some. When 1s are written to Port 3 pins, they are pulled high by.

Port 3 pins that are externally being pulled low will source. Port 3 also serves the functions of various special features. Port 0 can also be configured to be the multiplexed low.

Port 3 also receives some control signals for Flash pro. In this mode, P0 has internal. Port 0 also receives the code bytes during Flash program. RXD serial input port.

External pullups are required during program. TXD serial output port. INT0 external interrupt 0. INT1 external interrupt 1. T0 timer 0 external input. When 1s are written to Port 1 pins, they are pulled high by. T1 timer 1 external input. Port 1 pins that are externally being pulled low will source. Datasehet external data memory write strobe.


RD external data memory read strobe. A high on this pin for two datsaheet cycles while. Port 1 also receives the low-order address bytes during. Flash programming and verification.

Address Latch Enable is an output pulse for latching the. This pin is also the program pulse input PROG during. Note, however, that one ALE. EA must be strapped to GND in. If dqtasheet, ALE operation can be disabled by setting bit 0 of. Note, however, that if lock bit 1 is programmed, EA will be. With the bit set, ALE is active only dur. Otherwise, the pin is. Setting the ALE-disable bit has no. This pin also receives the volt programming enable volt. Program Store Enable is the read strobe to external pro.

When the AT89C52 is executing code from external pro.

Input to the inverting oscillator amplifier and input to the. Output from the inverting oscillator amplifier. A map of the on-chip memory area called the Special Func. In that case, the reset or inactive values of.

Note that not all of the addresses are occupied, and unoc. Timer 2 Registers Control and status bits are contained in. Read accesses to these addresses will in general return.

Table 4 for Timer 2. User software should not write 1s to these unlisted loca. Interrupt Registers The individual interrupt enable bits are. Two priorities can be set for each of the. Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2 will not be set when either. Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and.

EXF2 must be cleared by software. When set, causes the serial port to use Timer 2 overflow pulses for its receive clock in serial. When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock in serial.


Timer 2 external enable. When set, allows a capture or reload to occur as a result of a negative transition on T2EX.

AT89C52 | 89C52 Microcontroller Datasheet & Pin Description

Timer or counter select for Timer 2. Instructions that use direct. That means the upper For example, the following direct addressing instruction. When an instruction accesses an internal location above. Instructions that use indirect addressing access the upper. In this function, the external input is sampled. For example, the following indirect. The new count value appears in the. Since two machine cycles Note that stack operations are examples of indirect.

To ensure that a given level is sampled at least. Timer 0 and 1. Timer 0 and Timer 1 in the AT89C52 operate the same way. In the capture mode, two options are selected by bit. This bit can then be used to generate an interrupt. The type of operation is. Timer 2 has three operating modes: In addition, the transition at T2EX.

The EXF2 bit, like.

TF2, can generate an interrupt. The capture mode is illus. Timer 2 consists of two 8-bit registers, TH2 and TL2. Timer function, the TL2 register is incremented every.

Atmel AT89C52

Since a machine cycle consists of 12 oscil. Auto-reload Up or Down Counter. Timer 2 can be programmed to count up or down when. Timer 2 Operating Modes. Upon reset, the DCEN bit. DCEN is set, Timer 2 can count dqtasheet or down, depending on. In the Counter function, the register is incremented in.

Timer in Capture Mode. Figure 2 shows Timer 2 automatically counting up when. A logic 1 at T2EX makes Timer 2.

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