HT46R74D-1 Holtek Semiconductor, HT46R74D-1 Datasheet - Page 31

• Manufacturer Part Number: HT46R74D-1
• Description: Dual Slope A/D Type MCU
• Manufacturer: Holtek Semiconductor

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Application Circuits
The following table shows the C1, C2 and R1 values corresponding to the different crystal values. For reference only.
Note: The resistance and capacitance for the reset circuit should be designed in such a way as to ensure that the VDD
Rev. 1.10
4MHz Crystal
4MHz Resonator
3.58MHz Crystal
3.58MHz Resonator
2MHz Crystal & Resonator
1MHz Crystal
480kHz Resonator
455kHz Resonator
429kHz Resonator
The function of the resistor R1 is to ensure that the oscillator will switch off should low voltage conditions occur.
Such a low voltage, as mentioned here, is one which is less than the lowest value of the MCU operating volt-
age. Note however that if the LVR is enabled then R1 can be removed.
is stable and remains within a valid operating voltage range before bringing RES high.
interference.
* Make the length of the wiring, which is connected to the RES pin as short as possible, to avoid noise
Crystal or Resonator
C1, C2
300pF
300pF
300pF
31
10pF
25pF
25pF
35pF
0pF
0pF
9.1k
10k
12k
10k
10k
10k
27k
10k
10k
R1
HT46R74D-1
January 11, 2007