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ATAM510 Datasheet(PDF) 6 Page - ATMEL Corporation

Part # ATAM510
Description  MARC4 4-bit MTP Universal Microcontroller
PDF  72 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATAM510 Datasheet(HTML) 6 Page - ATMEL Corporation

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4711B–4BMCU–01/05
ATAM510
2.2
Components of MARC4 Core
The core contains ROM, RAM, ALU, a program counter, RAM address registers, an instruction
decoder and an interrupt controller. The following sections describe each functional block in
more detail.
2.2.1
EEPROM
The program memory (EEPROM) is programmed with the customer application program. The
EEPROM is addressed by a 12-bit wide program counter, thus predefining a maximum program
bank size of 4 Kbytes. 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 sub-
routines accessible with single byte instructions (SCALL). The corresponding memory map is
shown in Figure 2-2. Look-up tables of constants can also be held in EEPROM and are
accessed via the MARC4’s built-in table instruction.
Figure 2-2.
EEPROM Map of the ATAM510
2.2.2
RAM
The MARC4 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.
Figure 2-3.
RAM Map
EEPROM
(4K x 8 bit)
Zero page
FFFh
1FFh
000h
FFFh
1F0h
1F8h
010h
018h
000 h
008h
020 h
1E8h
1E0h
140h
180h
040h
0C 0h
008h
$A U T O SL E E P
$R E SE T
INT0
INT1
INT2
INT 3
INT4
INT5
INT 6
INT7
1E0h
1C 0h
100h
080h
Zer o
page
000h
RAM
FCh
00h
Autosleep
FFh
03h
04h
X
Y
SP
RP
TOS-1
Expression
stack
Return
stack
Global
variables
07h
(256 x 4-bit)
Global
variables
4-bit
TOS
TOS-1
TOS-2
30
SP
Expression stack
Return stack
0
11
12-bit
RP
v



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