HT67F60 datasheet(54/242 Pages) HOLTEK

54 / 242 page

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

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

LIRC

LXT

Low Speed Oscillation

High Speed Oscillation

HXT

ERC

HIRC

High Speed Oscillation

Configuration Option

fH/64

fH/32

fH/16

fH/8

fH/4

fH/2

6-stage Prescaler

fSUB

Low Speed Oscillation

Configuration Option

fSYS

HLCLK,

CKS2~CKS0 bits

Fast Wake-up from SLEEP Mode or

IDLE Mode Control (for HXT only)

System Clock Configurations

The actual source clock used for each of the high speed and low speed oscillators is chosen via

configuration options. The frequency of the slow speed or high speed system clock is also

determined using the HLCLK bit and CKS2 ~ CKS0 bits in the SMOD register. Note that two

oscillator selections must be made namely one high speed and one low speed system oscillators. It is

not possible to choose a no-oscillator selection for either the high or low speed oscillator.

External Crystal/ Ceramic Oscillator – HXT

The External Crystal/Ceramic System Oscillator is one of the high frequency oscillator choices,

which is selected via configuration option. For most crystal oscillator configurations, the simple

connection of a crystal across OSC1 and OSC2 will create the necessary phase shift and feedback

for oscillation, without requiring external capacitors. However, for some crystal types and

frequencies, to ensure oscillation, it may be necessary to add two small value capacitors, 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. An additional configuration

option must be setup to configure the device according to whether the oscillator frequency is high,

defined as equal to or above 1MHz, or low, which is defined as below 1MHz.

HT67F60 Datasheet(PDF) 54 Page - Holtek Semiconductor Inc

HT67F60 Datasheet(HTML) 54 Page - Holtek Semiconductor Inc

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