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ATSAM2553 Datasheet(PDF) 16 Page - ATMEL Corporation |
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ATSAM2553 Datasheet(HTML) 16 Page - ATMEL Corporation |
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16 / 29 page  16 6399A–DRMSD–13-Oct-08 ATSAM2553 8.2 Scanning (Keyboard, Switches, LEDs, Sliders Figure 8-1. Scanning (Keyboard, Switches, LEDs, Sliders All timings relative to 12.288 MHz crystal between X1 and X2. tsclk tka tioa tkd tiod tka tioh tkd tiog tio tkbd KBDIO/ SCLK ROW BR[0-10] MK[0-10] Table 8-2. Timing Parameters Symbol Parameter Min Typ Max Unit Tkbd Keyboard access (KBDIO high time) 1.3 µs Tio Switches/leds access (KBDIO low time) 3.9 µs Tsclk Internal scanning clock period 325 ns Tka Keyboard valid from rising KBDIO 1.1 µs tkd Break (contact1) and make (contact2) data from Keyboard floating from rising KBDIO 1.2 1.5 µs tioa Switch data valid from falling KBDIO 3.6 µs tiod Switch data floating from falling KBDIO 3.7 4 µs tiog LED data MK guard time 27 163 ns tioh LED data floating from rising KBDIO 082 ns |
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