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AT89S8252-24PU Datasheet, PDF (1/34 Pages) ATMEL Corporation – 8-bit Microcontroller with 8K Bytes Flash | |||
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Features
⢠Compatible with MCS-51⢠Products
⢠8K Bytes of In-System Reprogrammable Downloadable Flash Memory
â SPI Serial Interface for Program Downloading
â Endurance: 1,000 Write/Erase Cycles
⢠2K Bytes EEPROM
â Endurance: 100,000 Write/Erase Cycles
⢠4V to 6V 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
⢠Programmable UART Serial Channel
⢠SPI Serial Interface
⢠Low-power Idle and Power-down Modes
⢠Interrupt Recovery From Power-down
⢠Programmable Watchdog Timer
⢠Dual Data Pointer
⢠Power-off Flag
Description
The AT89S8252 is a low-power, high-performance CMOS 8-bit microcomputer with
8K bytes of downloadable Flash programmable and erasable read only memory and
2K bytes of EEPROM. The device is manufactured using Atmelâs high-density nonvol-
atile memory technology and is compatible with the industry-standard 80C51
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 downloadable Flash on a monolithic chip, the Atmel AT89S8252 is a powerful
microcomputer which provides a highly-flexible and cost-effective solution to many
embedded control applications.
The AT89S8252 provides the following standard features: 8K bytes of downloadable
Flash, 2K bytes of EEPROM, 256 bytes of RAM, 32 I/O lines, programmable watch-
dog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level
interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In
addition, the AT89S8252 is designed with static logic for operation down to zero fre-
quency and supports two software selectable power saving modes. The Idle Mode
stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt sys-
tem to continue functioning. The Power-down mode saves the RAM contents but
freezes the oscillator, disabling all other chip functions until the next interrupt or hard-
ware reset.
The downloadable Flash can be changed a single byte at a time and 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 Lock Bit 2 has been activated.
8-bit
Microcontroller
with 8K Bytes
Flash
AT89S8252
Rev. 0401Eâ02/00
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