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Документ "FT 3120 / FT 3150 Smart Transceiver Data Book" ( No
005-0139-01A) на стр 2-6:
"The architecture is stack-oriented; one 8-bit wide stack is used for
data references, and the ALU operates on the TOS ("Top of Stack")
register and the next entry in the data stack which is in RAM. A
second stack stores the return address for CALL instructions, and may
also be used for temporary data storage. This stack architecture leads
to very compact code. Tables 2.3, 2.4, and 2.5 outline instruction
set".
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