AT89S53 DATASHEET PDF

AT89S53 datasheet, AT89S53 circuit, AT89S53 data sheet: ATMEL – 8-bit Microcontroller with 12K Bytes Flash,alldatasheet, datasheet, Datasheet search site. AT89S53 datasheet, AT89S53 circuit, AT89S53 data sheet: ATMEL – 8-Bit Microcontroller with 12K Bytes Flash,alldatasheet, datasheet, Datasheet search site. AT89S53 8-bit Microcontroller With 12k Bytes Flash Features. Compatible with MCSTM Products 12K Bytes of In-System Reprogrammable Downloadable.

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Three-level Program Memory Lock. Low-power Idle and Power-down Modes. Interrupt Recovery From Power-down. By combining a versatile 8-bit CPU with downloadable Flash on a monolithic chip, the. Atmel AT89S53 is a powerful microcomputer which provides a highly-flexible and. The AT89S53 provides the following standard features: In addition, the AT89S53 is. Power-down mode saves the RAM contents but freezes the oscillator, disabling all.

The downloadable Flash can change a single byte at a time and is accessible through. Port 0 can also be configured to be the multiplexed low. In this mode, P0 has internal.

Port 0 also receives the code bytes during Flash program. External pullups are required during program. When 1s are written to Port 1 pins, they are pulled high by. Port 1 pins that are externally being pulled low will source. Some Port 1 pins provide additional functions. Port 3 pins that are externally being pulled low will source. Port 3 also serves the functions of various special features. Port 3 also receives some control signals for Flash pro. RXD serial input port.

TXD serial output port. INT0 external interrupt 0. INT1 external interrupt 1. T0 timer 0 dattasheet input. T1 timer 1 external input. SS Slave port select input. WR external data memory write strobe.

MOSI Master data output, slave data input pin.

RD external data memory read strobe. MISO Master data input, slave data output pin. A high on this pin for two machine cycles while. SCK Master clock output, slave clock input pin. Port 1 also receives the low-order address bytes during.

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Address Latch Enable is an output pulse for latching the. Flash programming and verification. This pin is also the program pulse input PROG during. When 1s are written to Port 2 pins, they are pulled high by.

Note, however, that one ALE. Port 2 pins that are externally being pulled low will source. If desired, ALE operation can be disabled by setting bit 0 of. Port 2 emits the high-order address byte during fetches. With the bit set, ALE is active only dur. Otherwise, the pin is. Setting the ALE-disable bit has no.

AT89S53 – AT89S53 40-Pin 24MHz 12kb 8-bit Microcontroller

In this application, Port 2 uses strong internal pul. During accesses to external data. Port 2 also receives the high-order address bits and some.

Program Store Enable is the read strobe to external pro. When the AT89S53 is executing code from external pro.

When 1s are written to Port 3 pins, they are pulled high by. EA must be strapped to GND in. Note, however, that if lock bit 1 is programmed, EA will be. Input to the inverting oscillator amplifier and input to the. EA should be strapped to V CC for internal program execu. This pin also receives the volt programming. Output from the inverting oscillator amplifier.

Timer 2 Registers Control and status bits are contained in. A map of the on-chip memory area called the Special Func. Table 9 for Timer 2. Note that not all of the addresses are occupied, and unoc. Read accesses to these addresses will in general return.

User software should not write 1s to these unlisted loca. In that case, the reset or inactive values of the. Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software.

When set, causes the serial port to use Timer 2 overflow pulses for its receive clock in serial port. Modes 1 and 3.

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AT89S53 Datasheet(PDF) – ATMEL Corporation

When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock in serial port. Timer 2 external enable. When set, allows a capture or reload to occur as a result of a negative transition on T2EX if. Timer 2 is not being used to clock the serial port. Timer or counter select for Timer 2. Prescaler Bits for the Watchdog Timer. When all three bits are set to “0”, the watchdog timer has a nominal period of When all three bits are set to “1”, the nominal period is ms.

Data Pointer Register Select. Each time this bit is set to “1” by user software, a datashedt is generated to reset the watchdog. Watchdog Timer Enable Bit. Dual Data Pointer Registers To facilitate accessing exter. The SPI data bits. DP0 at SFR address locations. Writing the SPI data.

The SPDR is double buff. Interrupt Registers The global interrupt enable bit and the. POF is set to “1” during.

It can be set and reset under software control. Two priorities can be set for each of the. These two bits control the SCK rate of the device configured as master. Data Memory – RAM.

AT89S53 Technical Data

Watchdog Timer Period Selection. That means the upper bytes have. When an instruction accesses an internal location above. Timer 0 and 1. Timer 0 and Timer 1 in the AT89S53 operate the same way. Instructions that use direct. For further information, see the October For example, the following direct addressing instruction. Microcontroller Data Book, page 2section titled. Instructions that at89ss53 indirect addressing access the upper.

For example, the following indirect.

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