HT46R01A datasheet(14/58 Pages) HOLTEK

14 / 58 page

HT46R01A

Rev. 1.10

August 13, 2008

S y s t e m C o n t r o l R e g i s t e r

C T R L 0

b 7

C L K M O D

b 0

Q O S C

P W M S E L

P F D C

P W M C

R T C o s c i l l a t o r q u i c k s t a r t - u p f u n c t i o n

0 : q u i c k s t a r t - u p

1 : s l o w s t a r t - u p

I / O o r P F D s e l e c t i o n

0 : I / O

1 : P F D

N o t i m p l e m e n t e d , r e a d a s " 0 "

I / O o r P W M s e l e c t i o n

0 : I / O

1 : P W M

P W M m o d e s e l e c t i o n

0 : 6 + 2

1 : 7 + 1

N o t i m p l e m e n t e d , r e a d a s " 0 "

S y s t e m c l o c k m o d e s e l e c t i o n

0 : h i g h s p e e d - I n t e r n a l R C a s s y s t e m c l o c k

1 : l o w s p e e d - R T C a s s y s t e m c l o c k , I n t e r n a l R C o s c i l l a t o r s t o p p e d

N o t e t h a t t h e s e s e l e c t i o n s a r e o n l y v a l i d i f t h e o s c i l l a t o r c o n f i g u r a t i o n

o p t i o n s h a v e s e l e c t e d t h e I n t e r n a l R C + R T C a s t h e s y s t e m c l o c k

System Control Register

- CTRL0

b 7

b 0

W D T E N 3

N o t i m p l e m e n t e d , r e a d a s " 0 "

W D T f u n c t i o n

d i s a b l e

o t h e r v a l u e s - e n a b l e

I N T E S 1

I N T E S 0

W D T E N 2 W D T E N 1 W D T E N 0

E x t e r n a l i n t e r r u p t e d g e t r i g g e r t y p e

I N T E S 1

I N T E S 0

d i s a b l e

r i s i n g e d g e t r i g g e r

f a l l i n g e d g e t r i g g e r

d u a l e d g e t r i g g e r

S y s t e m C o n t r o l R e g i s t e r

C T R L 1

System Control Register

- CTRL1

Input/Output Ports

Holtek microcontrollers offer considerable flexibility on

their I/O ports. There are seven I/O pins whose input or

output designation is under user program control and an

additional input pin. Additionally, as there are pull-high

resistor and wake-up software configurations for each

pin, the user is provided with an I/O structure to meet the

needs of a wide range of application possibilities.

Each device has a single I/O port known as Port A,

which has a corresponding data register known as PA.

This register is mapped to the Data Memory with an ad-

dresses as shown in the Special Purpose Data Memory

table. Seven of these I/O lines can be used for input and

output operations and one line as an input only. For in-

put operation, these ports are non-latching, which

means the inputs must be ready at the T2 rising edge of

instruction

²MOV A,[m]², where m denotes the port ad-

dress. For output operation, all the data is latched and

remains unchanged until the output latch is rewritten.

Pull-high Resistors

Many product applications require pull-high resistors for

their switch inputs usually requiring the use of an exter-

nal resistor. To eliminate the need for these external re-

sistors, I/O pins PA0~PA6, when configured as an input

have the capability of being connected to an internal

pull-high resistor. These pull-high resistors are

selectable via a register known as PAPU, located in the

Data Memory. The pull-high resistors are implemented

using weak PMOS transistors.

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