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SA2532 Datasheet(PDF) 6 Page - Sames |
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SA2532 Datasheet(HTML) 6 Page - Sames |
6 / 13 page SAN3010 sames sames sames sames 6/13 Flowchart for Microcontroller interface to AS253x single-chip-telephone Notes: RowX,ColX,ColY: see table1 1 tclk= 256/3.58MHz = 71.5µs all timings: Tol.:+-30µs wait >20ms after AS253x off-hook to ensure correct start-up Start Loop=0 Row1 force low all other rows/cols=Hi Z Col Y=high ? No sync Yes delay4 wait 4.5 tclk=321µs and disable all rows/cols= Hi Z delay3 wait 4.5 tclk=321µs and force RowY low all other rows/cols= Hi Z =SCAN2 delay2 wait 1.5 tclk=107.25µs and disable all rows/cols= Hi Z delay1 wait 1 tclk=71.5µs and force RowX high all other rows/cols= Hi Z =SCAN1 delay5 wait 4.5 tclk= 321µs and force ColX high all other rows/cols= Hi Z =SCAN3 Loop = 9 ? Loop= Loop+1 No delay6 wait 1.5 tclk=107.25µs and disable all rows/cols= Hi Z delay7 wait 24*9 tclk=15.5ms Yes another key entry? Yes No end Key_in 12 Appendix B: Flowchart: |
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