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AT90S1200

8-Bit Microcontroller with 1K bytes In-System Programmable Flash

Atmel Corporation 

Description

Block Diagram

The AT90S1200 is a low-power CMOS 8-bit microcontroller based on the AVR RISC

architecture. By executing powerful instructions in a single clock cycle, the AT90S1200

achieves throughputs approaching 1 MIPS per MHz allowing the system designer to

optimize power consumption versus processing speed.

The AVR core combines a rich instruction set with the 32 general purpose working reg-

isters. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU),

allowing two independent registers to be accessed in one single instruction executed in

one clock cycle. The resulting architecture is more code efficient while achieving

throughputs up to ten times faster than conventional CISC microcontrollers.

Figure 1. The AT90S1200 Block Diagram

The architecture supports high-level languages efficiently as well as extremely dense

assembler code programs. The AT90S1200 provides the following features: 1K byte of

In-System Programmable Flash, 64 bytes EEPROM, 15 general purpose I/O lines, 32

general purpose working registers, internal and external interrupts, programmable

watchdog timer with internal oscillator, an SPI serial port for program downloading and

two software selectable power-saving modes. The Idle Mode stops the CPU while allow-

2 AT90S1200

0838H–AVR–03/02

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