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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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HT56R22 Datenblatt(PDF) 28 Page - Holtek Semiconductor Inc |
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HT56R22 Datenblatt(HTML) 28 Page - Holtek Semiconductor Inc |
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28 / 127 page  HT56R22/HT56R23/HT56R24/HT56R25/HT56R26 Rev. 1.30 28 December 26, 2014 Wake-up Function Register - PAWK When the microcontroller enters the Idle/Sleep Mode, various methods exist to wake the device up and con- tinue with normal operation. One method is to allow a falling edge on the I/O pins to have a wake-up function. This register is used to select which Port A I/O pins are used to have this wake-up function. Pull-high Registers - PAPU, PBPU, PCPU, PDPU, PEPU, PFPU, PGPU The I/O pins, if configured as inputs, can have internal pull-high resistors connected, which eliminates the need for external pull-high resistors. This register selects which I/O pins are connected to internal pull-high resistors. Software COM Register - SCOMC The pins PB0~PB3 on Port B can be used as SCOM lines to drive an external LCD panel. To implement this function, the SCOMC register is used to setup the cor- rect bias voltages on these pins. Oscillator Various oscillator options offer the user a wide range of functions according to their various application require- ments. The flexible features of the oscillator functions ensure that the best optimisation can be achieved in terms of speed and power saving. Oscillator selections and operation are selected through a combination of configuration options and registers. System Oscillator Overview In addition to being the source of the main system clock the oscillators also provide clock sources for the Watch- dog Timer and Time Base functions. External oscillators requiring some external components as well as a two fully integrated internal oscillators, requiring no external components, are provided to form a wide range of both fast and slow system oscillators. Type Name Freq. Pins External Crystal HXT 400kHz~ 12MHz OSC1/ OSC2 External RC ERC 400kHz~ 12MHz OSC1 Internal High Speed RC HIRC 4, 8 or 12MHz ¾ External Low Speed Crystal LXT 32768Hz ¾ XT1/ XT2* Internal Low Speed RC LIRC 32kHz ¾ System Clock Configurations There are five system oscillators. Three high speed os- cillators and two low speed oscillators. The high speed oscillators are the external crystal/ceramic oscillator - HXT, the external - ERC, and the internal RC oscillator - HIRC. The two low speed oscillator are the external 32768Hz oscillator - LXT and the internal 32kHz oscilla- tor - LIRC. External Crystal/Resonator Oscillator - HXT The simple connection of a crystal across OSC1 and OSC2 will create the necessary phase shift and feed- back for oscillation. However, for some crystals and most resonator types, to ensure oscillation and accurate frequency generation, it is necessary to add two small value external capacitors, C1 and C2. The exact values of C1 and C2 should be selected in consultation with the crystal or resonator manufacturer ¢s specification. For oscillator stability and to minimise the effects of noise and crosstalk, it is important to ensure that the crystal and any associated resistors and capacitors along with inter connecting lines are all located as close to the MCU as possible. Crystal Oscillator C1 and C2 Values Crystal Frequency C1 C2 12MHz ¾¾ 8MHz ¾¾ 4MHz ¾¾ 1MHz ¾¾ 455kHz (see Note 2) 10pF 10pF Note: 1. C1 and C2 values are for guidance only. 2. XTAL mode configuration option: 455kHz. 3. RP1=5M W~10MW is recommended. Crystal Recommended Capacitor Values O S C 1 O S C 2 R f T o i n t e r n a l c i r c u i t s I n t e r n a l O s c i l l a t o r C i r c u i t C 1 C 2 R P 1 N o t e : 1 . R p i s n o r m a l l y n o t r e q u i r e d . C 1 a n d C 2 a r e r e q u i r e d . 2 . A l t h o u g h n o t s h o w n O S C 1 / O S C 2 p i n s h a v e a p a r a s i t i c c a p a c i t a n c e o f a r o u n d 7 p F . Crystal/Resonator Oscillator - HXT |
Ähnliche Teilenummer - HT56R22_14 |
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Ähnliche Beschreibung - HT56R22_14 |
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