at90s2323 ATMEL Corporation, at90s2323 Datasheet - Page 3

• Manufacturer Part Number: at90s2323
• Description: 8-bit Microcontroller With 2k Bytes Of In-system Programmable Flash At90s2323 At90ls2323 At90s2343 At90ls2343
• Manufacturer: ATMEL Corporation

1004D–09/01
Figure 2. The AT90S/LS2323 Block Diagram
The AT90S2323/2343 provides the following features: 2K bytes of In-System Program-
mabl e Flash, 128 bytes EEPROM, 128 bytes SRAM, 3 (A T90S/LS2323)/5
(AT90S/LS2343) general-purpose I/O lines, 32 general-purpose working registers, an 8-
bit timer/counter, internal and external interrupts, programmable Watchdog Timer with
internal oscillator, an SPI serial port for Flash Memory downloading and two software-
selectable power-saving modes. The Idle mode stops the CPU while allowing the
SRAM, timer/counters, SPI port and interrupt system to continue functioning. The
Power-down mode saves the register contents but freezes the oscillator, disabling all
other chip functions until the next interrupt or hardware reset.
The device is manufactured using Atmel’s high-density nonvolatile memory technology.
The On-chip Flash allows the program memory to be reprogrammed in-system through
an SPI serial interface. By combining an 8-bit RISC CPU with ISP Flash on a monolithic
GND
VCC
PROGRAMMING
INSTRUCTION
INSTRUCTION
PROGRAM
PROGRAM
REGISTER
COUNTER
CONTROL
DECODER
FLASH
LOGIC
LINES
REGISTERS
REGISTER
PURPOSE
GENERAL
POINTER
STATUS
STACK
SRAM
DATA REGISTER
ALU
SPI
X
Y
Z
PORTB
8-BIT DATA BUS
PORTB DRIVERS
PB0 - PB2
REG. PORTB
DATA DIR.
AT90S/LS2323/2343
MCU CONTROL
OSCILLATOR
WATCHDOG
INTERRUPT
REGISTER
INTERNAL
COUNTER
EEPROM
TIMER/
TIMER
UNIT
OSCILLATOR
TIMING AND
CONTROL
RESET
3