Application Circuits

Note:

It is recommended that a 22

mF decoupling capacitor is placed between VSS and VDD.

If the crystal has a value above 1MHz the capacitors are not required.

HT48CA6

Rev. 1.10

11

July 26, 2002

No.

Mask Option

6

Carry frequency selection.

Carry frequency=

Clock Source

(2 or 3) 2

n

´

where n=0~3.

7

Carrier duty selection. There are two types of selection: 1/2 duty or 1/3 duty.

If carrier frequency= Clock Source / (2, 4, 8 or 16), the duty cycle will be 1/2 duty.

If carrier frequency= Clock Source / 3, the duty cycle will be 1/3 duty.

If carrier frequency= Clock Source / (6, 12 or 24), the duty cycle can be 1/2 duty or 1/3 duty.

8

OSC type selection. This option is to decide if an RC or Crystal oscillator is chosen as system clock. If the

Crystal oscillator is selected, the SST (System Start-up Timer) default is activated, otherwise the SST is

disabled.

O S C 1

O S C 2

H T 4 8 C A 6

R E S

P C 0 / R E M

P A 0

P A 1

P A 2

P A 3

P B 0

P B 1

1 W

3 0 0 p .

3 0 0 p .

X ' t a l

( s e e N o t e 2 )

0 . 1 m .

P B 2

P B 3

P B 4

P B 5

P B 6

P B 7

P A 7

P A 6

P A 5

P A 4

2 2 m .