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HT6P12 Datasheet(PDF) 9 Page - Holtek Semiconductor Inc |
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HT6P12 Datasheet(HTML) 9 Page - Holtek Semiconductor Inc |
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9 / 17 page  received 24 bits of customer code are inter- preted as control signals. Output function selection When the last 4 bits (bits 21~24) of the received 24 bits of customer code are interpreted as 4 kinds of control signal outputs, each control signal output controls an output function. There are totally 8 kinds of output functions, i.e., ARM/ DISARM, PANIC, ON/OFF, Q3, ARM, DISARM, MUTE, and FIND_CAR, which are further classified into three types A, B, and C. Each type consists of 4 different output func- tions. The mapping of the last 4 bits to the 4 kinds of output functions is as shown. The output type is defined by the option table. Arm/Disarm control If the arm and disarm control signals are set on the same data bit (Output Type A or C), the arm and disarm states are toggle-controlled by the same key of the encoder. But, if the arm and disarm control signals are set as 2 different data bits (Output Type B), the arm and disarm states are separately controlled. After the disarm control signal has been re- ceived, and the LSI is in the arm state, the car lamp will flash twice successively (defined by the “Arm →Disarm lamp flash times” in the op- tion table), the chirp sound will be output twice continuously (defined by the “Arm →Disarm chirp sound times” in the option table), the UNLOCK pin will be active high, a duration (defined by the “UNLOCK Time” in the option table), the ARM pin will be active low, and the alarm system will enter the disarm state. On the other hand, after the arm control signal has been received, the car lamp will flash once (de- fined by the “Disarm →Arm lamp flash times” in the option table), the LED will flash at 1Hz rate continuously (defined by the “Arm state LED flash period”), the chirp sound will be output once (defined by the “Disarm →Arm chirp sound times” in the option table), the LOCK pin will be active high, a daration (defined by the “LOCK Time” in the option table), the ARM pin will be active high, and the alarm system will enter the arm state. In addition, the duty of the chirp sound and lamp flash are both settable in the option table. Fig.1 Arm/Disarm Timing HT6P12 9 2nd Oct ’97 |
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