Integrated circuit having programmable pull device configured to enable/disable first function in favor of second function according to predetermined scheme before/after reset
US6052746A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1998 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Apr 14, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4077
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for selectively enabling a pull device coupled to a multiplexed terminal connector based on the function of the terminal connector. When the terminal functions as a general purpose input/output (GPIO), the pull device is enabled on reset or on setting a control bit. For operation as a data port, the pull device is disabled, and on reset the pull device is enabled only after any pending data transaction has completed. Upon completion of the reset period the pull device is again disabled for data port operation. In one embodiment, a terminal has a first interruptible function and a second uninterruptible function. The terminal is coupled to a pull device and control logic. If the second function is active, the control logic enables the pull device with a time delay sufficient that the second function is completed prior to the enabling of the pull device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.