| Flash (Kbytes) | 12 |
| ISP | SPI |
| EEPROM (Kbytes) | 2 |
| RAM (Bytes) | 256 |
| F.max (MHz) | 24 |
| Vcc (V) | 2.7-5.5 |
| I/O Pins | 32 |
| UART | 1 |
| 16-bit Timers | 3 |
| Watchdog | Yes |
| SPI | Yes |
| Packages | TQFP 44 PDIP 40 PDIP 42 PLCC 44 |
| Pb-Free Packages | TQFP 44 PDIP 40 PDIP 42 PLCC 44 |
In-System Programmable Microcontroller with 12K bytes Flash 2K bytes EEPROM
The AT89S8253 is a low-power, high-performance CMOS 8-bit microcontroller with 12K bytes of In-System Programmable (ISP) Flash program memory and 2K bytes of EEPROM data memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip downloadable Flash allows the program memory to be reprogrammed in-system through an SPI serial interface or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with downloadable Flash on a monolithic chip, the Atmel AT89S8253 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89S8253 provides the following standard features: 12K bytes of In-System Programmable Flash, 2K bytes of EEPROM, 256 bytes of RAM, 32 I/O lines, programmable watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector, four-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S8253 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next external interrupt or hardware reset.
The on-board Flash/EEPROM is accessible through the SPI serial interface. Holding RESET active forces the SPI bus into a serial programming interface and allows the program memory to be written to or read from, unless one or more lock bits have been activated.
| Speed (MHz) | Power Supply |
Ordering Code | Package | Operation Range |
| 24 | 2.7V to 5.5V | AT89S8253-24AU AT89S8253-24JU AT89S8253-24PU AT89S8253-24PSU |
44A 44J 40P6 42PS6 |
Industrial (-40° C to 85° C) |