Application Circuits

The following table shows the C1, C2 and R1 value according different crystal values.

Crystal or Resonator

C1, C2

R1

4MHz Crystal

0pF

10k

W

4MHz Resonator (3 pin)

0pF

12k

W

4MHz Resonator (2 pin)

10pF

12k

W

3.58MHz Crystal

0pF

10k

W

3.58MHz Resonator (2 pin)

25pF

10k

W

2MHz Crystal & Resonator (2 pin)

25pF

10k

W

1MHz Crystal

35pF

27k

W

480kHz Resonator

300pF

9.1k

W

455kHz Resonator

300pF

10k

W

429kHz Resonator

300pF

10k

W

Note:

The resistance and capacitance for reset circuit should be designed in such a way as to ensure that the VDD is

stable and remains within a valid operating voltage range before bringing RES to high.

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

interference.

HT46R47/HT46C47

Rev. 1.30

19

May 3, 2004

5 . 5 V

0 . 9 V

0 V

R e s e t S i g n a l

R e s e t

* 1

* 2

N o r m a l O p e r a t i o n

R e s e t

L V R D e t e c t V o l t a g e

Low Voltage Reset

Note:

*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system

clock pulses before entering the normal operation.

*2: Since the low voltage has to maintain in its original state and exceed 1ms, therefore 1ms delay enter the

reset mode.

O S C 1

O S C 2

O S C

C i r c u i t

R E S

0 . 1 m F *

1 0 0 k W

V D D

V S S

0 . 1 m F

0 . 0 1 m F *

1 0 k W

R C S y s t e m O s c i l l a t o r

O S C 1

O S C 2

4 7 0 p F

O S C 1

O S C 2

R 1

C 1

C 2

C r y s t a l S y s t e m O s c i l l a t o r

F o r t h e v a l u e s ,

s e e t a b l e b e l o w

O S C C i r c u i t

S e e R i g h t S i d e

H T 4 6 R 4 7 / H T 4 6 C 4 7

P D 0 / P W M

P B 0 / A N 0

P B 3 / A N 3

P A 0 ~ P A 2

P A 3 / P F D

P A 4 / T M R

P A 5 / I N T

P A 6 ~ P A 7