Sharp R-409JSB User Manual

United States Patent [191 [ll] 4,317,181 Teza et a1. [45] Feb. 23, 1982 [54] FOUR MODE MICROCOMPUTER POWER [57] ABSTRACT SAVE OPERATION A calculator h

4,317,181 1 FOUR MODE MICROCOMPUTER POWER SAVE OPERATION BACKGROUND OF THE INVENTION This invention relates to calculators and more partic ularly to c

4,317,181 3 improvement of controller output logic level in the standby mode. DETAILED DESCRIPTION ()1: THE INVENTION Referring to FIG. 1. a typical h

4,317,181 5 means 51. no active clock signals are output from the ?rst power switching means 60 to the ?rst circuit group 52, thereby forcing the ?rst

4,317,181 7 with either static or dynamic logic in the ?rst and sec ond circuit groups 52 and 53. In a preferred embodiment, the independent circuit g

4,317,181 at node 101 may degrade sufficiently so as to enable both transistors 130 and 132, thereby providing a direct DC current pathway between th

4,317,181 11 connected to a main oscillator 406 which provides a main oscillator clock output in response to receiving an enable input from the contro

4,317,181 13 In the process and display mode, state 1 l of FIG. 10 and Table l, the display oscillator 404 and processor oscillator 406 may be enabled

4,317,181 15 rationless clocked controlled state output logic as shown in FIG. 13. The system of FIG. 5 provides an output at a ?xed voltage level (at

4,317,181 17 18 (a) operator input means having means for generating fl 10W pOyvcr standby mode in response to receiv an ON signal, an OFF signal and

US. Patent Feb. 23, 1982 Sheet 1 of8 4,317,181 .0. 0w? wla?loww \0/ \ __\ \<@,\. O

US. Patent Feb. 23, 1982 Sheet 2 of 8 4,317,181 9 AT T E R Y ~50 [5/ F 19, .3 0 POWER ' CONSUMPTION CONTROLLER ~55- — — — — 53 7/ CIRCUIT CIRCUIT

U.S. Patent CALCULATOR OFF- STATE -______ ___-__—_ Feb. 23, 1982 Sheet 4 of 8 4,317,181 OPERABLE FIRST POWER SECOND POWER STATE swncnms SWITCHING MODE

US. Patent Feb. 23, 1982 Sheet 7 of 8 4,317,181 ANYKEY SOFTWARE PUc ANYKEY REQUEST TlMEKEEP/PUC OFF INST. F 19. // TIMEKEEP OVERLOAD/ PUC TIMEKEEP O-V

U.S. Patent Feb. 23, 1982 Sheet 8 of 8 4,317,181