HT48C062(2006) 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT48C062
(Rev.:2006)

Cost-Effective I/O Type 8-Bit MCU

Holtek Semiconductor 

HT48R062/HT48C062

Options

The following table shows eight kinds of code option in the HT48R062/HT48C062. All the code options must be defined

to ensure proper system functioning.

No.

Options

1 WDT clock source: WDTOSC or fSYS/4

2 WDT function: enable or disable

3 LVR function: enable or disable

4 CLRWDT instruction(s): one or two clear WDT instruction(s)

5 System oscillator: RC or crystal

6 PA and PB pull-high resistors: none or pull-high

7 PA0~PA7 wake-up: enable or disable

Application Circuits

V DD

0 .0 1 m F *

VDD

100kW

0 .1 m F

RES

10kW

0 .1 m F *

VSS

P A 0~P A 7

P B 0~P B 2

O SC

C ir c u it

S e e R ig h t S id e

O SC1

O SC2

H T 4 8 R 0 6 2 /H T 4 8 C 0 6 2

V DD

470pF

O SC1

R O SC

fS Y S /4

O SC2

N M O S o p e n d r a in

C1

O SC1

C2

R1

O SC2

R C S y s te m O s c illa to r

24kW < R OSC< 1M W

C r y s ta l S y s te m O s c illa to r

F o r th e v a lu e s ,

s e e ta b le b e lo w

O S C C ir c u it

Note:

The resistance and capacitance for reset circuit should be designed to ensure that the VDD is stable and re-

mains in a valid range of the operating voltage before bringing RES high.

²*² Make the length of the wiring, which is connected to the RES pin as short as possible, to avoid noise

interference.

The following table shows the C1, C2 and R1 values corresponding to the different crystal values. (For refer-

ence only)

Crystal or Resonator

C1, C2

R1

4MHz Crystal

25pF

10kW

4MHz Resonator

10pF

12kW

3.58MHz Crystal

25pF

10kW

3.58MHz Resonator

25pF

10kW

2MHz Crystal

30pF

12kW

2MHz Resonator

25pF

12kW

1MHz Crystal

100pF

10kW

480kHz Resonator

300pF

9.1kW

455kHz Resonator

300pF

10kW

429kHz Resonator

300pF

10kW

400kHz Resonator

300pF

10kW

The function of the resistor R1 is to ensure that the oscillator will switch off should low voltage condi-

tions occur. Such a low voltage, as mentioned here, is one which is less than the lowest value of the

MCU operating voltage. Note however that if the LVR is enabled then R1 can be removed.

Rev. 1.11

11

October 30, 2006

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