JPS6488657A - Stack control circuit - Google Patents
Stack control circuitInfo
- Publication number
- JPS6488657A JPS6488657A JP24549687A JP24549687A JPS6488657A JP S6488657 A JPS6488657 A JP S6488657A JP 24549687 A JP24549687 A JP 24549687A JP 24549687 A JP24549687 A JP 24549687A JP S6488657 A JPS6488657 A JP S6488657A
- Authority
- JP
- Japan
- Prior art keywords
- bank
- stack area
- register
- interruption processing
- coincidence detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To prevent the runaway of a program by switching to a bank fixed forcibly when a microprocessor accesses an address space to show a stack area. CONSTITUTION:A bank switching circuit 28, when a CPU accesses a stack area and a coincidence detecting signal is outputted from a coincidence detecting circuit 27, selects a fixed bank regardless of the data set to a bank register 25. Namely, a return destination address is stored into the stack area of a bank 0, shifted to an interruption processing and the bank is set to a bank register 25 toward the bank register 25 during the interruption processing. When the interruption processing is completed, the bank register 25 is on the bank 3. Since the stack area is accessed, a coincidence detecting signal is outputted, and the output from a decoder 29 makes the bank 0 active. Thus, the correct return destination address is read.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24549687A JPS6488657A (en) | 1987-09-29 | 1987-09-29 | Stack control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24549687A JPS6488657A (en) | 1987-09-29 | 1987-09-29 | Stack control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6488657A true JPS6488657A (en) | 1989-04-03 |
Family
ID=17134532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24549687A Pending JPS6488657A (en) | 1987-09-29 | 1987-09-29 | Stack control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6488657A (en) |
-
1987
- 1987-09-29 JP JP24549687A patent/JPS6488657A/en active Pending
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