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EM78P813BQ Datasheet(PDF) 38 Page - ELAN Microelectronics Corp |
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EM78P813BQ Datasheet(HTML) 38 Page - ELAN Microelectronics Corp |
38 / 65 page ![]() EM78P813 8-bit OTP Micro-controller __________________________________________________________________________________________________________________________________________________________________ * This specification is subject to change without notice. 38 2004/8/19 (V1.6) COM2 SEG V1 V2 V4 V5 GND 30us V1 V2 V4 V5 GND V1 V2 V4 V5 GND Fig.26 key scan waveform for 1/16 duty Bit 5 (KEYSTRB) : Key strobe enable control bit 0/1 disable/enable key strobe signal , if you set this bit , segment will switch to strobe signal temporally and output zero signal ( one instruction long ) one by one from segment 50 to segment 65. During one segment strobe time, CPU will check port7(0:3) equal to "1111" or not. If not, CPU will latch a zero at RB PAGE1 and RC PAGE1 one by one depends on which segment strobe. After strobe, this bit will be cleared . Fig.27 is key strobe signal. REGISTER RB(0) RB(1) RB(2) RB(3) RB(4) RB(5) RB(6) RB(7) RC(0) RC(1) RC(2) RC(3) RC(4) RC(5) RC(6) RC(7) STROBE SEG50 SEG51 SEG52 SEG53 SEG54 SEG55 SEG56 SEG57 SEG58 SEG59 SEG60 SEG61 SEG62 SEG63 SEG64 SEG65 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 One instruction 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 Fig.27 key strobe signal |
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