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T48C893 датащи(PDF) 9 Page - ATMEL Corporation

номер детали T48C893
подробное описание детали  The multiple times programmable (MTP) version for the MARC4 ROM types
PDF  82 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T48C893 датащи(HTML) 9 Page - ATMEL Corporation

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T48C893
T48C893
Rev. A4, 22-Jan-02
9 (82)
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
94 8975
Figure 5. RAM map
3.2.3
Registers
The
MARC4 controller has seven programmable
registers and one condition code register. They are shown
in the following programming model.
Program Counter (PC)
The program counter (PC) is a 12-bit register which
contains the address of the next instruction to be fetched
from the ROM. Instructions currently being executed are
decoded in the instruction decoder to determine the
internal micro-operations. For linear code (no calls or
branches) the program counter is incremented with every
instruction cycle. If a branch-, call-, return-instruction or
an interrupt is executed, the program counter is loaded
with a new address. The program counter is also used with
the TABLE instruction to fetch 8-bit wide ROM
constants.
TOS
CCR
0
3
0
3
0
7
0
7
7
0
11
RP
SP
X
Y
PC
–– B
I
Program counter
Return stack pointer
Expression stack pointer
RAM address register (X)
RAM address register (Y)
Top of stack register
Condition code register
Carry / borrow
Branch
Interrupt enable
Reserved
0
7
C
0
0
0
Figure 6. Programming model



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