EP0134966A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A battery powered key entry device including a processor and a power conservation system
Assignee: JP Morgan Delaware
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Filing: 1984-07-05
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Granted: —
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Expires: 2004-07-05
Abstract
Abstract In a self-contained battery powered key entry device, the keyboard (2) is driven from a microprocessor (1) and its output sensed by the microprocessor to generate drive signals for an infra-red transmitter (24). The sense lines (DBO-DB7) are monitored so that, on a key depression, the microprocessor is switched to an operating mode from its low-power standby mode. When all sensed signals have been processed and outputted, the microprocessor is returned to the low-power standby mode. A delay may be incorporated.
Inventors
- 👤 Patrick Maurice Bland
- 👤 William Hawkins Bolt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 15:01
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F1/00; G06F1/26; G06F1/32; G06F1/3203; G06F1/3206; G06F1/3215; G06F3/023; G06F3/0231
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A battery powered key entry device comprising a keyboard (2) and a microprocessor (1) coupled to energise drive lines (P10-P17) of the keyboard and to sense signals on a plurality of sense lines (DO-D7) from the keyboard corresponding to key depressions and to generate, in response to the sense line signals coded output signals to drive an infra-red light emitting device (24), and including a power conservation system, characterised in that the power conservation system comprises first means (3) responsive to a signal on any of the sense lines to generate a first signal (on 19), and second means (4,5,6,7,8,9) responsive to the first signal to power the microprocessor up from its low power standby mode and to a microprocessor output signal (on 20) indicating completion of processing of all received sense signals to return the microprocessor to its low power standby mode.
Claim 2
Dependent Claim
143 words
A battery powered key entry device comprising a keyboard (2) and a microprocessor (1) coupled to energise drive lines (P10-P17) of the keyboard and to sense signals on a plurality of sense lines (DO-D7) from the keyboard corresponding to key depressions and to generate, in response to the sense line signals coded output signals to drive an infra-red light emitting device (24), and including a power conservation system, characterised in that the power conservation system comprises first means (3) responsive to a signal on any of the sense lines to generate a first signal (on 19), and second means (4,5,6,7,8,9) responsive to the first signal to power the microprocessor up from its low power standby mode and to a microprocessor output signal (on 20) indicating completion of processing of all received sense signals to return the microprocessor to its low power standby mode.
Claim 3
Dependent Claim
29 words
A key entry device according to claim 1 in which said tirst means includes a NOR circuit (3) having an associated input coupled to each of the sense lines.
Claim 4
Dependent Claim
43 words
A key entry device according to claim 2 in which the second means includes a first latch circuit (4,5,6) coupled to the output of the NOR circuit and to receive said microprocessor output signal for switching respectively between its set and reset states.
Claim 5
Dependent Claim
39 words
A key entry device according to claim 3 including a second latch circuit (9) having a first input coupled to the output of the first latch circuit and its output coupled to the microprocessor low power standby mode input.
Claim 6
Dependent Claim
42 words
A key entry device according to claim 4 including a delay circuit (7) coupled between the output of said first latch circuit and an input of a third latch circuit (8) having its output coupled to a resetting input of the microprocessor.
References Cited (Backward Citations)
No citation records indexed.
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