JPS5783851A - Condition code generating system - Google Patents
Condition code generating systemInfo
- Publication number
- JPS5783851A JPS5783851A JP55159501A JP15950180A JPS5783851A JP S5783851 A JPS5783851 A JP S5783851A JP 55159501 A JP55159501 A JP 55159501A JP 15950180 A JP15950180 A JP 15950180A JP S5783851 A JPS5783851 A JP S5783851A
- Authority
- JP
- Japan
- Prior art keywords
- condition code
- instruction
- information
- hardware
- memory
- 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
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
- G06F9/30094—Condition code generation, e.g. Carry, Zero flag
Landscapes
- Engineering & Computer Science (AREA)
- Software Systems (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Executing Machine-Instructions (AREA)
Abstract
PURPOSE:To reduce the quantity of hardware and simplify a program and facilitate the error detection, by reading a condition code on a basis of information related to the execution result of an instruction and information designating a condition code set type in an information processing device. CONSTITUTION:Condition code set type information corresponding to an instruction is read out from a memory 3 by using the instruction code or a part of it as an address input, and an address of a memory 5 is designated by this information and contents of a state holding register 11 to read out a condition code from the memory 5. Consequently, it is unnecessary that the microprogram for instruction execution recognizes the condition code set type to start selectively a hardware only for this type, and thus, the microprogram is simplified. Further, the design is facilitated, and the quantity of hardware is reduced, and the detection of erroneous operations is facilitated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55159501A JPS5783851A (en) | 1980-11-14 | 1980-11-14 | Condition code generating system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55159501A JPS5783851A (en) | 1980-11-14 | 1980-11-14 | Condition code generating system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5783851A true JPS5783851A (en) | 1982-05-25 |
Family
ID=15695141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55159501A Pending JPS5783851A (en) | 1980-11-14 | 1980-11-14 | Condition code generating system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5783851A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5455336A (en) * | 1977-10-12 | 1979-05-02 | Nec Corp | Data processor controlled by microprogram |
-
1980
- 1980-11-14 JP JP55159501A patent/JPS5783851A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5455336A (en) * | 1977-10-12 | 1979-05-02 | Nec Corp | Data processor controlled by microprogram |
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