AT89S8253_07 Datasheet, PDF (1/56 Pages) ATMEL Corporation – 8-bit Microcontroller with 12K Bytes Flash and 2K Bytes EEPROM

Features
• Compatible with MCS^®-51 Products
• 12K Bytes of In-System Programmable (ISP) Flash Program Memory
– SPI Serial Interface for Program Downloading
– Endurance: 10,000 Write/Erase Cycles
• 2K Bytes EEPROM Data Memory
– Endurance: 100,000 Write/Erase Cycles
• 64-byte User Signature Array
• 2.7V to 5.5V Operating Range
• Fully Static Operation: 0 Hz to 24 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Nine Interrupt Sources
• Enhanced UART Serial Port with Framing Error Detection and Automatic Address
Recognition
• Enhanced SPI (Double Write/Read Buffered) Serial Interface
• Low-power Idle and Power-down Modes
• Interrupt Recovery from Power-down Mode
• Programmable Watchdog Timer
• Dual Data Pointer
• Power-off Flag
• Flexible ISP Programming (Byte and Page Modes)
– Page Mode: 64 Bytes/Page for Code Memory, 32 Bytes/Page for Data Memory
• Four-level Enhanced Interrupt Controller
• Programmable and Fuseable x2 Clock Option
• Internal Power-on Reset
• 42-pin PDIP Package Option for Reduced EMC Emission
Description
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 non-
volatile memory technology and is compatible with the industry-standard MCS-51
instruction set and pinout. The on-chip downloadable Flash allows the program mem-
ory 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 download-
able 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 Pro-
grammable 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 con-
tents 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.
8-bit
Microcontroller
with 12K Bytes
Flash and 2K
Bytes EEPROM
AT89S8253
Preliminary
Rev. 3286A–MICRO–7/04
1