HT45R35 datasheet(20/59 Pages) HOLTEK

20 / 59 page

HT45R35

Rev. 1.30

May 14, 2010

If the configuration options select PA0~PA7 to be normal I/O pins, then the corresponding bits in the ASCR2 register, bit

0, bit1, bit4 and bit5, must be set to

²0² to disable the RC1/RC2, RC3/RC4, RC9/RC10 or RC11/RC12 pull-low resis-

tors. These bits are set to

²0² or ²1² by software.

Bit No.

Label

Function

ASPLON0

Defines RC1 pull-low and RC2 pull-low is non-pull-low. ASPLON0=

0=RC1 and RC2 are non-pull-low

1=RC1 and RC2 are pull-low or not according RC1, RC2 analog is on or off.

RC1/RC2 is connected to pull-low when ASPLON0=1 and AS1ON/AS2ON analog switch is

off.

ASPLON1

Defines RC3 pull-low and RC4 pull-low is non-pull-low. ASPLON1=

0=RC3 and RC4 are non-pull-low

1=RC3 and RC4 are pull-low or not according RC3, RC4 analog is on or off.

RC3/RC4 is connected to pull-low when ASPLON1=1 and AS3ON/AS4ON analog switch is

off.

ASPLON2

Defines RC5 pull-low and RC6 pull-low is non-pull-low. ASPLON2=

0=RC5 and RC6 are non-pull-low

1=RC5 and RC6 are pull-low or not according RC5, RC6 analog is on or off.

RC5/RC6 is connected to pull-low when ASPLON2=1 and AS5ON/AS6ON analog switch is

off.

ASPLON3

Defines RC7 pull-low and RC8 pull-low is non-pull-low. ASPLON3=

0=RC7 and RC8 are non-pull-low

1=RC7 and RC8 are pull-low or not according RC7, RC8 analog is on or off.

RC7/RC8 is connected to pull-low when ASPLON3=1 and AS7ON/AS8ON analog switch is

off.

ASPLON4

Defines RC9 pull-low and RC10 pull-low is non-pull-low. ASPLON4=

0=RC9 and RC10 are non-pull-low

1=RC9 and RC10 are pull-low or not according RC9, RC10 analog is on or off.

RC9/RC10 is connected to pull-low when ASPLON4=1 and AS9ON/AS10ON analog switch is

off.

ASPLON5

Defines RC11 pull-low and RC12 pull-low is non-pull-low. ASPLON5=

0=RC11 and RC12 are non-pull-low

1=RC11 and RC12 are pull-low or not according RC11, RC12 analog is on or off.

RC11/RC12 is connected to pull-low when ASPLON5=1 and AS11ON/AS12ON analog switch

is off.

6~7

Unused bit, read as

²0²

ASCR2 (1CH) Register

T . G . 1

T . G . 2

T . G . 3

T . G . 4

T . G . 5

T . G . 6

T . G . 7

T . G . 8

T . G . 9

T . G . 1 0

T . G . 1 1

T . G . 1 2

A S C R 0

A S C R 1

A S C R 2

R C 1

R C 2

R C 3

R C 4

R C 5

R C 6

R C 7

R C 8

R C 9

R C 1 0

R C 1 1

R C 1 2

R C O U T

I N

R R E F

T i m e r B

R C 1 ~ R C 1 2

T . G . 1 ~ T . G . 1 2

R C 1 ~ R C 1 2

P u l l - l o w

C R E F

Analog Switch

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