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GMS81C2012 датащи(PDF) 77 Page - Hynix Semiconductor |
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GMS81C2012 датащи(HTML) 77 Page - Hynix Semiconductor |
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77 / 92 page ![]() Hyundai Micro Electronics GMS81C2020/GMS81C2120 Nov. 1999 Ver 0.0 preliminary 77 Figure 21-3 Application Example of Unused Input Port Minimizing Current Consumption in Stop Mode The Stop mode is designed to reduce power consumption. To minimize current drawn during Stop mode, the user should turn-off output drivers that are sourcing or sinking current, if it is practical. Weak pull-ups on port pins should be turned off, if possible. All inputs should be either as VSS or at VDD (or as close to rail as possible). An intermediate voltage on an input pin causes the input buffer to draw a significant amount of current. Figure 21-4 Timing of STOP Mode Release by External Interrupt OUTPUT PIN GND i In the left case, much current flows from port to GND. X ON OFF OUTPUT PIN GND i In the left case, Tr. base current flows from port to GND. i=0 X OFF ON VDD L ON OFF OPEN GND VDD L ON OFF To avoid power consumption, there should be low output ON OFF O O VDD O to the port . STOP Mode Normal Operation Oscillator (XI pin) N+1 NN+2 00 01 FE FF 00 00 N-1 N-2 Clear Basic Interval Timer STOP Instruction Execution Normal Operation Stabilization Time tST > 20mS Internal Clock External Interrupt BIT Counter |
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