Title:
MICROCOMPUTER OPERABLE IN EMULATION MODE WITH INTERNAL AND EXTERNAL PERIPHERAL DEVICES
Document Type and Number:
Japanese Patent JP3452147
Kind Code:
B2
Abstract:
PURPOSE: To obtain a computer operable in an emulation mode with internal and external peripheral devices.
CONSTITUTION: The computer is provided with a central processing unit 12, an internal address decoder 14, an internal memory and an internal peripheral device 16 which are connected to a data/address bus 20. The central processing unit 12 is provided with an input/output port for external access 22 in a user mode. The input/output port for external access 22 is connected with an external peripheral device 28 and an external address decoder 24, which outputs to the central processing unit 12 a signal CSI preventing the preload of an the internal address decoder 14 when the external peripheral device is selected in the emulation mode.
Inventors:
Philip Basse
Pierre Taler
Pierre Taler
Application Number:
JP27131293A
Publication Date:
September 29, 2003
Filing Date:
October 04, 1993
Export Citation:
Assignee:
STMicroelectronics Society Anonymous
International Classes:
G06F11/22; G06F11/26; G06F11/36; G06F13/42; G06F15/78; (IPC1-7): G06F11/22; G06F15/78
Domestic Patent References:
| JP1263737A | ||||
| JP1109459A | ||||
| JP6077247A |
Attorney, Agent or Firm:
Takashi Koshiba