E Ascii Unit Memory Map - Omron SYSMAC C200H-ASC02 Operation Manual

Memory Structure
The memory structure is shown below. The addresses go from &H0000 to &HFFFF (0 to 65535) and are
divided into byte units. The 24 Kbytes (24,576 bytes) from &H2000 to &H7FFF make up the program area.
The contents of this program area can be read with the PEEK function (refer to page 62 for details). &H0000
to &H1FFF and &H8000 to &HFFFF (shaded in the diagrams below) are set by the system and so cannot be
read.
7
&H0000
I/O area 1
&H0020
System work area
&H2000
Assembly language
program area
Set with
MSET
command
BASIC Text area
Set with the
CLEAR System stack area
command
Character string
area
&H8000
Common memory
area or the Data
Section
&H9000
I/O area 2
&HA000
System area
&HFFFF
: Program area
: System settings area
Appendix E
ASCII Unit Memory Map
0
Memory Area
I/O area 1
(&H0000 to &H001F)
System work area
(&H0020 to &H1FFF)
Assembly
language
program area
BASIC Text are
System stack
area
Character string
area
Common memory area or
the Data Section
(&H8000 to &H8FFF)
I/O area 2
(&H9000 to &H9FFF)
System area
(&HA000 to &HFFFF)
This area is for internal ports of the
microprocessor 63B03.
This area is used by the system.
&H2000 Stores assembly language program. The
to
size of this area can be changed with MSET
&H7FFF command.
Stores intermediate language codes of
BASIC program. The size of this area can
be changed with the MSET command
Stack area used by the system.
Stores character strings. The size of this
area is normally 200 bytes and is set with
the CLEAR command.
RAM area for interfacing between ASCII
Unit and PC. When this area is accessed,
an I/O UNIT ERROR may occur. Do not
access this area.
Area to which ports ACIA, PTM, and RTC
are assigned.
This is the ROM area.
Remarks
135