AT90S2323-10PI datasheet(8/64 Pages) ATMEL

Part #	AT90S2323-10PI

Description	8-Bit Microcontroller with 2K Bytes of In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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AT90S/LS2323/2343

1004D–09/01

The AVR has Harvard architecture – with separate memories and buses for program

and data. The program memory is accessed with a two-stage pipeline. While one

instruction is being executed, the next instruction is pre-fetched from the program mem-

ory. This concept enables instructions to be executed in every clock cycle. The program

memory is in-system downloadable Flash memory.

With the relative jump and call instructions, the whole 1K address space is directly

accessed. Most AVR instructions have a single 16-bit word format. Every program

memory address contains a 16- or 32-bit instruction.

During interrupts and subroutine calls, the return address Program Counter (PC) is

stored on the stack. The stack is effectively allocated in the general data SRAM and

consequently, the stack size is only limited by the total SRAM size and the usage of the

SRAM. All user programs must initialize the SP in the reset routine (before subroutines

or interrupts are executed). The 8-bit stack pointer (SP) is read/write-accessible in the

I/O space.

The 128 bytes data SRAM + register file and I/O registers can be easily accessed

through the five different addressing modes supported in the AVR architecture.

The memory spaces in the AVR architecture are all linear and regular memory maps.

Figure 6. Memory Maps

A flexible interrupt module has its control registers in the I/O space with an additional

global interrupt enable bit in the status register. All the different interrupts have a sepa-

rate interrupt vector in the interrupt vector table at the beginning of the program

memory. The different interrupts have priority in accordance with their interrupt vector

position. The lower the interrupt vector address, the higher the priority.

EEPROM

(128 x 8)

$000

$07F

EEPROM Data Memory

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