HT67F60 datasheet(55/242 Pages) HOLTEK

55 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

OS C1

OS C2

To i nt er nal

ci rc ui ts

In te rn al

O sci lla to r

Ci rc ui t

No te :1 . Rp i s nor ma lly not r equi r ed. C 1 and C2 a re r equ ir ed.

2. A lt hough not s how n OS C1 /O SC 2 pi ns h av e a pa ra si ti c

c apac it an ce o f a r ound 7pF .

Crystal/Resonator Oscillator — HXT

Crystal Oscillator C1 and C2 Values

Crystal Frequency

12MHz

0pF

8MHz

0pF

4MHz

0pF

1MHz

100pF

455kHz (see Note2)

100pF

Note: 1. C1 and C2 values are for guidance only.

2. XTAL mode configuration option: 455kHz.

Crystal Recommended Capacitor Values

External RC Oscillator – ERC

Using the ERC oscillator only requires that a resistor, with a value between 56kΩ and 2.4MΩ, is

connected between OSC1 and VDD, and a capacitor is connected between OSC1 and ground,

providing a low cost oscillator configuration. It is only the external resistor that determines the

oscillation frequency; the external capacitor has no influence over the frequency and is connected

for stability purposes only. Device trimming during the manufacturing process and the inclusion of

internal frequency compensation circuits are used to ensure that the influence of the power supply

voltage, temperature and process variations on the oscillation frequency are minimised. As a

resistance/frequency reference point, it can be noted that with an external 120kΩ resistor connected

and with a 5V voltage power supply and temperature of 25°C degrees, the oscillator will have a

frequency of 8MHz within a tolerance of 2%. Here only the OSC1 pin is used, which is shared with

I/O pin PB1, leaving pin PB2 free for use as a normal I/O pin.

OS C1

470p F

V DD

R OS C

External RC Oscillator — ERC

HT67F60 Datasheet(PDF) 55 Page - Holtek Semiconductor Inc

HT67F60 Datasheet(HTML) 55 Page - Holtek Semiconductor Inc

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