HT46R12A Holtek Semiconductor Inc., HT46R12A Datasheet - Page 28

• Manufacturer Part Number: HT46R12A
• Description: Ht46r12a -- A/d Type 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

Application Circuits
Note:
Rev. 1.00
1. Crystal/resonator system oscillators
2. Reset circuit
3. For applications where noise may interfere with the reset circuit and for details on the oscillator external
components, refer to Application Note HA0075E for more information.
For crystal oscillators, C1 and C2 are only required for some crystal frequencies to ensure oscillation. For
resonator applications C1 and C2 are normally required for oscillation to occur. For most applications it is
not necessary to add R1. However if the LVR function is disabled, and if it is required to stop the oscillator
when V
should be selected in consultation with the crystal/resonator manufacturer specifications.
The reset circuit resistance and capacitance values should be chosen to ensure that VDD is stable and re-
mains within its operating voltage range before the RES pin reaches a high level. Ensure that the length of
the wiring connected to the RES pin is kept as short as possible, to avoid noise interference.
DD
falls below its operating range, it is recommended that R1 is added. The values of C1 and C2
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HT46R12A
August 3, 2007