IA8044/IA8344
SDLC COMMUNICATIONS CONTROLLER
Preliminary Data Sheet
As of Production Version 00
Internal Data Memory
The Internal Data Memory address is always 1 byte wide. The memory space is 192 bytes
large (00H to BFH), and can be accessed by either direct or indirect addressing. The Special
Function Registers occupy the upper 128 bytes. This SFR area is available only by direct
addressing. Internal memory which overlaps the SFR address space is only accessible by indirect
addressing.
Internal Memory
FFh
BFh
Special Function
Registers
Addressable
BITS in SFRs
(128 BITS)
RAM
Indirect
Addressing
80h
80h
Direct Addressing
7Fh
30h
2Fh
Bit Addressable
Memory
20h
1Fh
Register Bank 3
18h
17h
Register Bank 2
Register Bank 1
10h
0Fh
08h
07h
Register Bank 0
00h
Internal Data Ram
8044 Internal Data Memory Addresses
00h to FFh
Copyright
innovASIC
2001
ENG210010112-00
www.innovasic.com
Customer Support:
1-888-824-4184
The End of Obsolescence
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