HT45R34

Rev. 1.20

17

October 15, 2007

Analog Switch

There are 12 analog switch lines in the microcontroller for RC1~RC12, and a corresponding Analog Switch control reg-

ister, which is mapped to the data memory of

²1AH².

Bit No.

Label

Function

0~4

ASON

Defines the analog switch for RC1~RC12 which is on. ASON=

00000b= Analog switch 1 on, other analog switch off

00001b= Analog switch 2 on, other analog switch off

00010b= Analog switch 3 on, other analog switch off

00011b= Analog switch 4 on, other analog switch off

00100b= Analog switch 5 on, other analog switch off

00101b= Analog switch 6 on, other analog switch off

00110b= Analog switch 7 on, other analog switch off

00111b= Analog switch 8 on, other analog switch off

01000b= Analog switch 9 on, other analog switch off

01001b= Analog switch 10 on, other analog switch off

01010b= Analog switch 11 on, other analog switch off

01011b= Analog switch 12 on, other analog switch off

01100b= All analog switch off

01101b= All analog switch off

01110b= All analog switch off

01111b= All analog switch off

1xxxxb= All analog switch off and RC OSC always off.

5~7

¾

Unused bit, read as

²0²

ASCR (1AH) 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 O N

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

C R E F

T i m e r B

Analog Switch