CHAPTER 3 METHODOLOGY 3.1 Overview The Water Monitoring ...

Figure 15. Flash Programming and Verification Waveforms – Parallel ModeAT89S52Flash Programming and Verification Characteristics (Parallel Mode)T A = 20°C to 30°C, V CC = 4.5 to 5.5VSymbol Parameter Min Max UnitsV PP Programming Supply Voltage 11.5 12.5 VI PP Programming Supply Current 10 mAI CC V CC Supply Current 30 mA1/t CLCL Oscillator Frequency 3 33 MHzt AVGL Address Setup to PROG Low 48t CLCLt GHAX Address Hold After PROG 48t CLCLt DVGL Data Setup to PROG Low 48t CLCLt GHDX Data Hold After PROG 48t CLCLt EHSH P2.7 (ENABLE) High to V PP 48t CLCLt SHGL V PP Setup to PROG Low 10 µst GHSL V PP Hold After PROG 10 µst GLGH PROG Width 0.2 1 µst AVQV Address to Data Valid 48t CLCLt ELQV ENABLE Low to Data Valid 48t CLCLt EHQZ Data Float After ENABLE 0 48t CLCLt GHBL PROG High to BUSY Low 1.0 µst WC Byte Write Cycle Time 50 µsP1.0 - P1.7P2.0 - P2.5P3.4PORT 0ALE/PROGPROGRAMMINGADDRESSt AVGLt GHDXt AVQVDATA INDATA OUTt GLGHt GHSLVERIFICATIONADDRESSEA/V PPV PPLOGIC 1LOGIC 0P2.7(ENABLE)t EHSHt EHQZP3.0(RDY/BSY)t GHBLtELQVt WCBUSYREADY19