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HT56R64 Datasheet(PDF) 65 Page - Holtek Semiconductor Inc |
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HT56R64 Datasheet(HTML) 65 Page - Holtek Semiconductor Inc |
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65 / 90 page  HT56R64 Rev. 1.60 65 May 21, 2012 Register Reset (Power-on) RES Reset (Normal Operation) WDT Time-out (Normal Operation) WDT Time-out (HALT) CLKMOD 000 - 0011 000 - 0011 000 - 0011 uuuu - uuu PAWU 0000 0000 0000 0000 0000 0000 uuuu uuuu PAPU 0000 0000 0000 0000 0000 0000 uuuu uuuu PBPU 0000 0000 0000 0000 0000 0000 uuuu uuuu PDPU 0000 0000 0000 0000 0000 0000 uuuu uuuu INTEDGE ---- 0000 ---- 0000 ---- 0000 ---- uuuu LCDCTRL 0000 0000 0000 0000 0000 0000 uuuu uuuu LCDOUT1 ---- -- 00 ---- -- 00 ---- -- 00 ---- -- uu LCDOUT2 0000 0000 0000 0000 0000 0000 uuuu uuuu MISC 0000 1010 0000 1010 0000 1010 uuuu uuuu MFIC 0000 0000 0000 0000 0000 0000 uuuu uuuu SIMCON0 1110 0000 1110 0000 1110 0000 uuuu uuuu SIMCON1 1000 00 - 1 1000 00 - 1 1000 00 - 1 uuuu uu - u SIMDR xxxx xxxx xxxx xxxx xxxx xxxx uuuu uuuu SIMAR/SIMCON2 0000 0000 0000 0000 0000 0000 uuuu uuuu Note: ²u² stands for unchanged ²x² stands for unknown ²-² stands for unimplemented Oscillator Various oscillator options offer the user a wide range of functions according to their various application require- ments. Five types of system clocks can be selected while various clock source options for the Watchdog Timer are provided for maximum flexibility. All oscillator options are selected through the configuration options. System Clock Configurations There are five methods of generating the system clock, two high oscillators, two low oscillators and an externally supplied clock. The two high oscillators are the external crystal/ceramic oscillator and the external RC network. The two low oscillators are the fully integrated 32K_INT oscillator and the external RTC oscillator. Selecting whether the low or high oscillator is used as the system oscillator is implemented using the HLCLK bit in the CLKMOD register. The source clock for the high and low oscillators is chosen via configuration options. The fre- quency of the slow oscillator is also determined using the SLOWC0~SLOWC2 bits in the CLKMOD register. System Crystal/Ceramic Oscillator After selecting the correct oscillator configuration op- tion, for most crystal oscillator configurations, the simple connection of a crystal across OSC1 and OSC2 will cre- ate the necessary phase shift and feedback for oscilla- tion, without requiring external capacitors. However, for some crystal types and frequencies, to ensure oscilla- tion, it may be necessary to add two small value capaci- tors, C1 and C2. Using a ceramic resonator will usually require two small value capacitors, C1 and C2, to be connected as shown for oscillation to occur. The values of C1 and C2 should be selected in consultation with the crystal or resonator manufacturer ¢s specification. In most applications, resistor RP1 is not required, however for those applications where the LVR function is not used, RP1 may be necessary to ensure the oscillator stops running when VDD falls below its operating range. The internal oscillator circuit contains a filter circuit to re- duce the possibility of erratic operation due to noise on the oscillator pins. More information regarding the oscillator is located in Application Note HA0075E on the Holtek website. O S C 2 O S C 1 C 2 C 1 R P 1 Crystal/Ceramic Oscillator |
Similar Part No. - HT56R64_12 |
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Similar Description - HT56R64_12 |
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