ST18AU1_DS View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST18AU1_DS' PDF : 87 Pages View PDF
ST18-AU1
11 MEMORY
11.1 Internal memory resource
One 8 Kword and two 16 Kword single port memories are included on-chip:
• Instruction memory on I space from address 0 to 16382 (16 K)
• X-Data memory on X space from address 0 to 16382 (16 K)
• Y-Data memory on Y space from address 256 to 8192
Note: the first 256 addresses of the Y space are reserved for the D950 memory-mapped
registers and for on-chip memory mapped peripherals.
Memory can be extended off-chip in one of two ways:
1: directly for I and X memory spaces
2: through the bus switch unit for all three memory spaces
The specific details on the operation of the BSU are described separately in Chapter 12.
Figure 11.1 Memory mapping
X-memory
Y-memory
I-memory
FFFF
64k FFFF
64k FFFF
64k
External
External
External
3FFF
16k
Internal RAM
0000
1FFF
8k
Internal RAM
00FF
Registers
3FFF
16k
Internal RAM
0000
All addresses are hexadecimal
External memory is accessed directly or through the bus switch
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