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SX28AC75-I/TQ データシート(PDF) 33 Page - List of Unclassifed Manufacturers

部品番号 SX28AC75-I/TQ
部品情報  Configurable Communications Controllers with EE/Flash Program Memory, In-System Programming Capability and On-Chip Debug
PDF  52 Pages
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メーカー  ETC [List of Unclassifed Manufacturers]
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SX28AC75-I/TQ データシート(HTML) 33 Page - List of Unclassifed Manufacturers

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© 2000 Scenix Semiconductor, Inc. All rights reserved.
- 33 -
www.scenix.com
SX18AC/SX20AC/SX28AC/SX18AC75/SX20AC75/SX28AC75
15.12
Subroutine Operation
15.12.1 Push Operation
When a subroutine is called, the return address is
pushed onto the subroutine stack. Specifically, each
address in the stack is moved to the next lower level in
order to make room for the new address to be stored.
Stack 1 receives the contents of the program counter.
Stack 8 is overwritten with what was in Stack 7. The con-
tents of stack 8 are lost.
15.12.2 Pop Operation
When a return instruction is executed the subroutine
stack is popped. Specifically, the contents of Stack 1 are
copied into the program counter and the contents of each
stack level are moved to the next higher level. For exam-
ple, Stack 1 receives the contents of Stack 2, etc., until
Stack 7 is overwritten with the contents of Stack 8. Stack
8 is left unchanged, so the contents of Stack 8 are dupli-
cated in Stack 7.
PC<10:0>
STACK 1
STACK 2
STACK 3
STACK 4
STACK 5
STACK 6
STACK 7
STACK 8
PC<10:0>
STACK 1
STACK 2
STACK 3
STACK 4
STACK 5
STACK 6
STACK 7
STACK 8



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