atam894 ATMEL Corporation, atam894 Datasheet - Page 4
atam894
Manufacturer Part Number
atam894
Description
Atam894 8k-flash Microcontroller
Manufacturer
ATMEL Corporation
Datasheet
1.ATAM894.pdf
(97 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
atam894R
Manufacturer:
ATMEL
Quantity:
5 000
Part Number:
atam894R
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
- Current page: 4 of 97
- Download datasheet (2Mb)
4.4
5. MARC4 Architecture
5.1
4
Reset Function
General Description
ATAM894
During each reset (power-on or brown-out) the configuration register is reset and reloaded with
the data from the configuration memory. This leads to a slightly different behavior compared to
the ROM versions. Both devices switch their I/Os to input during reset but the ROM part has the
mask selected pull-up or pull-down resistors active while the MTP has them removed until the
download is finished.
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 communication 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 associated 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 5-1.
System
Reset
clock
Clock
Reset
MARC4 Core
Sleep
Program
memory
Instruction
controller
Interrupt
decoder
Instruction
On-chip peripheral modules
bus
I/O bus
MARC4 CORE
PC
Memory bus
CCR
SP
RP
X
Y
TOS
ALU
256 x 4-bit
RAM
4679D–4BMCU–05/05
Related parts for atam894
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: