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ATAR092-D Datasheet(PDF) 3 Page - ATMEL Corporation

Part # ATAR092-D
Description  Low-current Microcontroller for Wireless Communication
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATAR092-D Datasheet(HTML) 3 Page - ATMEL Corporation

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ATAR092-D
4594C–4BMCU–12/04
Introduction
The ATAR092-D is a member of Atmel’s family of 4-bit single-chip microcontrollers.
They contain ROM, RAM, parallel I/O ports, two 8-bit programmable multifunction
timer/counters, voltage supervision, interval timer with watchdog function, a sophisti-
cated on-chip clock generation with integrated RC-, 32-kHz crystal- and 4-MHz crystal
oscillators.
MARC4 Architecture
General Description
The MARC4 microcontroller consists of an advanced stack-based, 4-bit CPU core and
on-chip peripherals. The CPU is based on the HARVARD architecture with physically
separate program memory (ROM) and data memory (RAM). Three independent buses,
the instruction bus, the memory bus and the I/O bus, are used for parallel communica-
tion between ROM, RAM and peripherals. This enhances program execution speed by
allowing both instruction prefetching, and a simultaneous communication to the on-chip
peripheral circuitry. The extremely powerful integrated interrupt controller with associ-
ated eight prioritized interrupt levels supports fast and efficient processing of hardware
events. The MARC4 is designed for the high-level programming language qFORTH.
The core includes both an expression and a return stack. This architecture enables
high-level language programming without any loss of efficiency or code density.
Figure 3. MARC4 Core
Table 1. Available Variants of ATAxx9x
Version
Type
ROM
E2PROM Peripheral
Packages
Flash device
ATAM893
4-Kbyte EEPROM
64 byte
SSO20
Production
ATAR092
4-Kbyte mask ROM
SSO20
Production
ATAR892
4-Kbyte mask ROM
64 byte
SSO20
Instruction
decoder
CCR
TOS
ALU
RAM
RP
X
Y
Program
256 x 4-bit
MARC4 CORE
Clock
Reset
Sleep
Memory bus
I/O bus
Instruction
bus
Reset
System
clock
Interrupt
controller
On-chip peripheral modules
memory
SP
PC


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