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HT6240-002 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT6240-002 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
6 / 14 page HT6240-002 6 December 16, 1999 Functional Description Key operation The input pins (IE0~IE3) and the output pins (OF0~OF7) constitute a max. of 4´8 key matrix which is also called standard key. The extended key is formed by input pin DATA and the scan output (OF5~OF7). The 4´8 key matrix and the extended key can transmit a max. of 256 in- struction. CT maintains ²L² and no transmission code is generated when two or more keys in standard key are pressed. Table 1 shows the relationship between the key matrix and the transmission code. Table 1 Transmission Code Key Input D1 D0 IE0 00 IE1 01 IE2 10 IE3 11 Transmission Code Scan Output D4 D3 D2 OF0 00 0 OF1 00 1 OF2 01 0 OF3 01 1 OF4 10 0 OF5 10 1 OF6 11 0 OF7 11 1 Transmission Code DATA Input D7 D6 D5 OF5 ¾¾ 1 OF6 ¾ 1 ¾ OF7 1 ¾¾ Custom code The custom code is made up of input pin DATA and scan output OF0~OF4. It has 8 bits (C0~C7); the lower 3 bits of the custom code (C5, C6 and C7) are fixed as ²0². Fig. 1 shows an example of custom code selection. Extended bit The extended bit is formed by input pin DATA and the scan output (OF5~OF7). Fig. 2 shows an example of extended bit selection. DA T A OF 5 O F 6 OF 7 D A T A c ode SW = O N SW = O F F D5 1 1 D6 1 0 D7 0 0 SW Fig. 2 D A TA O F 0 O F1 O F 2 O F3 O F 4 C u st o m c ode C0 1 C1 1 C2 0 C3 0 C4 1 C5 0 C6 0 C7 0 Fig. 1 |
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