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HT95R35 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc |
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HT95R35 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc |
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44 / 73 page  HT95R35 Rev. 1.00 44 October 7, 2009 Register Reset (Power-on) RES or LVR Reset (Normal/Green) RES or LVR Reset (Sleep/Idle) WDT Time-out (Normal/Green) WDT Time-out (Sleep/Idle) DTRXC ---- - 001 ---- - 001 ---- - 001 ---- - 001 ---- - uuu DTRXD ---- 0000 ---- 0000 ---- 0000 ---- 0000 ---- uuuu RTCC 0 - 0 - ---- u - u - ---- u - u - ---- u - u - ---- u - u - ---- MODE 000 - ---- 00u - ---- 00u - ---- 00u - ---- 00u - ---- MODE_1 ---- -- 00 ---- -- 00 ---- -- 00 ---- -- 00 ---- -- 00 MFIC0 - 000 - 000 - 000 - 000 - 000 - 000 - 000 - 000 - uuu - uuu MFIC1 - 000 - 000 - 000 - 000 - 000 - 000 - 000 - 000 - uuu - uuu PFDC 0000 ---- 0000 ---- 0000 ---- 0000 ---- uuuu ---- PFDD 0000 0000 0000 0000 0000 0000 0000 0000 uuuu uuuu SIMCTL0 1110 000 - 1110 000 - 1110 000 - 1110 000 - uuuu uuuu SIMCTL1 1000 0001 1000 0001 1000 0001 1000 0001 uuuu uuuu SIMDR xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx uuuu uuuu SIMAR/ SIMCTL2 0000 0000 0000 0000 0000 0000 0000 0000 uuuu uuuu VOICEC ---- --- 0 ---- --- 0 ---- --- 0 ---- --- 0 ---- --- u VOL xxx - ---- uuu - ---- uuu - ---- uuu - ---- uuu - ---- DAL xxxx ---- uuuu ---- uuuu ---- uuuu ---- uuuu ---- DAH xxxx xxxx uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu Note: ²u² stands for unchanged ²x² stands for unknown ²-² stands for unimplemented Oscillator There are two oscillator circuits within the controller. One is for the system clock which uses an externally connected 32768Hz crystal. The other is an internal watchdog oscillator. System Crystal/Ceramic Oscillator The system clock is generated using an external 32768Hz crystal or ceramic resonator connected be- tween pins X1 and X2. From this clock source an inter- nal circuit generates a 14.32MHz clock source which is also required by the system. This frequency generator circuit requires the addition of externally connected RC components to pin XC to form a low pass filter for the 14.32MHz output frequency stabilisation. Watchdog Timer Oscillator The WDT oscillator is a fully integrated free running RC oscillator with a typical period of 65 ms at 5V, requiring no external components. It is selected via configuration op- tion. If selected, when the device enters the Power Down Mode, the system clock will stop running, however the WDT oscillator will continue to run and keep the watch- dog function active. However, as the WDT will consume a certain amount of power when in the Power Down Mode, for low power applications, it may be desirable to disable the WDT oscillator by configuration option. X 1 X 2 X C 1 5 k W 3 n F 4 7 n F Crystal/Ceramic Oscillator |
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