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T48C862-R8 Datasheet

  • T48C862-R8

  • MCU

  • Atmel   Atmel

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T48C862-R8
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 microcontrollers鈥?built-in table instruction.
Figure 10.
ROM Map of the Microcontroller Block
FFFh
1F8h
1F0h
1E8h
1E0h
1E0h
1C 0h
180h
140h
INT7
INT6
INT5
INT4
INT3
INT2
INT1
INT0
(4 K x 8 bit)
7FFh
SCALL addresses
EEPROM
page
100h
0C 0h
080h
1FFh
Zero page
000h
020h
018h
010h
008h
000h
040h
008h
000h
$RESET
$AUTOSLEEP
RAM
The microcontroller block contains a 256 x 4-bit wide static random access memory
(RAM), which is used for the expression stack. The return stack and data memory are
used for variables and arrays. The RAM is addressed by any of the four 8-bit wide RAM
address registers SP, RP, X and Y.
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, and return their
results to the expression stack. The microcontroller 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.
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 microcontroller instruction set supports the exchange of data between the top ele-
ments of the expression stack and the return stack. The two stacks within the RAM have
a user definable location and maximum depth.
Expression Stack
Return Stack
15
4590B鈥?BMCU鈥?2/03

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