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參數(shù)資料
| 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)： | 6/63頁 |
| 文件大?。?/td> | 503K |
| 代理商： | M44C890 |
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M44C890
M44C090
Rev.A4, 14-Dec-01
6 (63)
2.2
Components of MARC4 Core
ROM
(2 K x 8 bit)
Zero page
7FFFh
1FFh
000h
1E8h
1E0h
1F0h
008h
010h
000h
020h
S
140h
180h
040h
0C0h
008h
000h
$AUTOSLEEP
$RESET
INT0
INT1
INT2
INT3
INT4
INT5
INT6
INT7
1E0h
1C0h
100h
080h
Zero
page
13391
Figure 4. ROM map of M44C090
The core contains ROM, RAM, ALU, program counter,
RAM address registers, instruction decoder and interrupt
controller. The following sections describe each
functional block in more detail:
2.2.1
ROM
The program memory (ROM) is mask programmed with
the customer application program during the fabrication
of the microcontroller. The ROM is addressed by a 12
–
bit
wide program counter, thus predefining a maximum
program bank size of 2 Kbytes. An additional 1 Kbyte of
ROM exists which is reserved for quality control self
–
test
software The lowest user ROM address segment is taken
up by a 512 byte zero page which contains predefined
start addresses for interrupt service routines and special
subroutines accessible with single byte instructions
(SCALL).
The corresponding memory map is shown in figure 4.
Look-up tables of constants can also be held in ROM and
are accessed via the MARC4
’
s built-in TABLE
instruction.
2.2.2
RAM
The M44C090 / M44C890 contains 256 x 4-bit wide static
random access memory (RAM). It is used for the
expression stack, the return stack and data memory for
variables and arrays. The RAM is addressed by any of the
four 8-bit wide RAM address registers SP, RP, X and Y.
Expression Stack
The 4-bit wide expression stack is addressed with the
expression stack pointer (SP). All arithmetic, I/O and
memory reference operations take their operands from,
and return their results to the expression stack. The
MARC4 performs the operations with the top of stack
items (TOS and TOS
–
1). The TOS register contains the
top element of the expression stack and works in the same
way as an accumulator. This stack is also used for passing
parameters between subroutines and as a scratch pad area
for temporary storage of data.
Return Stack
The 12-bit wide return stack is addressed by the return
stack pointer (RP). It is used for storing return addresses
of subroutines, interrupt routines and for keeping loop
index counts. The return stack can also be used as a
temporary storage area.
The MARC4 instruction set supports the exchange of data
between the top elements of the expression stack and the
return stack. The two stacks within the RAM have a user
definable location and maximum depth.
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