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HT6240 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT6240 Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
7 / 16 page HT6240-002 Rev. 1.30 7 November 6, 2002 On table 2, the relationship between the key matrix and the transmission code is shown when custom code= ²0000 0000². The asterisks means that HT6240-002 can just send five words at a time even if a legal key is pressed for a long time. The others mean that HT6240-002 will send five or six words, even some more words if a legal key is still pressed. Table 2 OF0 OF1 OF2 OF3 OF4 OF5 OF6 OF7 IE0 00 04 08 0C 10* 14* 18* 1C* IE1 01 05 09* 0D* 11* 15* 19* 1D* IE2 02 06 0A* 0E* 12* 16* 1A* 1E* IE3 03 07 0B* 0F* 13* 17* 1B* 1F* There are 64 instructions when the custom code= ²0000 0000 ² in HT6240-002. The transmission output CT is still ²L² and the transmission code will not be sent when two or more keys are pressed simultaneously. If custom code ¹²0000 0000² then Fig. 9 shows the for- mation of the transmission code. The transmission code consists of a head pulse, 8-bit custom code and 8-bit data code. Fig. 10 shows bit ²0² and bit ²1². The formation of a 1-word transmission code without carrier is shown in detail in Fig.11. Output CT should combine with the carrier when CT is high. CT will send at least three words if we press a legal key. CT may send three or four words, or several words de- pending on the length of time the legal key is pressed. (see Fig. 12) Power on reset function (PRB) The power on reset function can be activated by con- necting a capacitor to PRB pin while power is applied. The time (tC) must be longer than 0.1ms when the volt- age in PRB pin (VC) becomes higher than 0.3VDD after the voltage in VDD pin exceeds 2.2V. When the power on reset function is activated, the standby state continues until an ²L² is input to IE0~IE3. 8 . 4 4 m s H e a d p u l s e 4 . 2 2 m s 4 . 2 2 m s C 0 C 1 C 2 C 3 C 4 C 5 C 6 C 7 D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 C u s t o m c o d e D a t a c o d e Fig. 9 The formation of the transmission code when custom code ¹²0000 0000² 0 . 5 3 m s 1 . 0 6 m s 0 . 5 3 m s 2 . 1 1 m s B i t " 0 " B i t " 1 " Fig. 10 8 . 4 4 m s 4 . 2 2 m s H e a d p u l s e C u s t o m c o d e C 0 = 0 D a t a c o d e C 1 = 1 C 2 = 1 C 3 = 0 C 4 = 0 C 5 = 0 C 6 = 0 C 7 = 0 D 0 = 0 D 1 = 0 D 2 = 0 D 3 = 0 D 4 = 1 D 5 = 0 D 6 = 0 D 7 = 0 4 . 2 2 m s 1 - w o r d Fig. 11 |
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