Application Circuits

Note:

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

10k

W

4MHz Resonator

10pF

12k

W

3.58MHz Crystal

25pF

10k

W

3.58MHz Resonator

25pF

10k

W

2MHz Crystal

30pF

12k

W

2MHz Resonator

25pF

12k

W

1MHz Crystal

100pF

10k

W

480kHz Resonator

300pF

9.1k

W

455kHz Resonator

300pF

10k

W

429kHz Resonator

300pF

10k

W

400kHz Resonator

300pF

10k

W

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.

HT48R062/HT48C062

Rev. 1.11

11

October 30, 2006

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

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

P A 0 ~ P A 7

P B 0 ~ P B 2

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

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

O S C 1

O S C 2

O S C

C i r c u i t

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

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

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

O S C C i r c u i t

O S C 1

O S C 2

R 1

C 1

C 2

O S C 1

O S C 2

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

4 7 0 p F