JPS5498149A - Microprocessor - Google Patents
MicroprocessorInfo
- Publication number
- JPS5498149A JPS5498149A JP503278A JP503278A JPS5498149A JP S5498149 A JPS5498149 A JP S5498149A JP 503278 A JP503278 A JP 503278A JP 503278 A JP503278 A JP 503278A JP S5498149 A JPS5498149 A JP S5498149A
- Authority
- JP
- Japan
- Prior art keywords
- cpu
- registers
- ports
- microprocessor
- input
- 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
Landscapes
- Microcomputers (AREA)
Abstract
PURPOSE: To reduce the number of registers without degrading CPU functions in a microprocessor.
CONSTITUTION: The I/O shared port for CPU transfers information supplied to port part 3 to the data bus 4 direction through input circuit 1 by an INPUT instruction, and latch-holds information sent from CPU through data bus 4 in output circuit 2 consisting of registers by an OUTPUT instruction, and then transfers it to the terminal equipment direction from read port part 3 by the next OUTPUT instruction. The microprocessor has m-bit I/O ports P1 to Pn consisting of m-number I/O shared ports like this. Unused ports are not connected to the external, and can hold temporarily contents of CPU in input circuit 2 by OUTPUT and INPUT instructions, so that it is possible to share the register of input circuit 2 with registers of CPU.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP503278A JPS5498149A (en) | 1978-01-19 | 1978-01-19 | Microprocessor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP503278A JPS5498149A (en) | 1978-01-19 | 1978-01-19 | Microprocessor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5498149A true JPS5498149A (en) | 1979-08-02 |
Family
ID=11600123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP503278A Pending JPS5498149A (en) | 1978-01-19 | 1978-01-19 | Microprocessor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5498149A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59206969A (en) * | 1983-05-11 | 1984-11-22 | Hitachi Ltd | Microprocessor |
JPS62145454A (en) * | 1985-12-20 | 1987-06-29 | Nec Corp | Input and output port control circuit |
-
1978
- 1978-01-19 JP JP503278A patent/JPS5498149A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59206969A (en) * | 1983-05-11 | 1984-11-22 | Hitachi Ltd | Microprocessor |
JPS62145454A (en) * | 1985-12-20 | 1987-06-29 | Nec Corp | Input and output port control circuit |
JPH0556549B2 (en) * | 1985-12-20 | 1993-08-19 | Nippon Electric Co |
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