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| 型號： | M44C890 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Low-Current Microcontroller for Wireless Communication |
| 中文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SSO-20 |
| 文件頁數(shù)： | 5/63頁 |
| 文件大小： | 503K |
| 代理商： | M44C890 |
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M44C890
M44C090
Rev.A4, 14-Dec-01
5 (63)
1
Introduction
The M44C090 / M44C890 are members of Atmels family
of 4-bit single-chip microcontrollers. They contain ROM,
RAM, parallel I/O ports, one 8-bit programmable multi-
function timer/counter, voltage supervisor, interval timer
with watchdog function and a sophisticated on-chip clock
generation with integrated RC-, 32-kHz crystal- and
4-MHz crystal-oscillators.
Table 2 provides an overview of the available variants.
Table 2 Available variants of M4xCx9x
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2
MARC4 Architecture
2.1
General Description
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.
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
TOS
ALU
RP
Clock
Reset
Sleep
Instruction
Reset
System
clock
Interrupt
On
–
chip peripheral modules
94 8973
Figure 3. MARC4 core
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