HT46R46 datasheet(19/42 Pages) HOLTEK

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HT46R46/HT46C46/HT46R47/HT46C47

Rev. 1.00

December 28, 2004

Bit No.

Label

Function

ACS0

ACS1

ACS2

ACS2, ACS1, ACS0: Select A/D channel

0, 0, 0: AN0

0, 0, 1: AN1

0, 1, 0: AN2

0, 1, 1: AN3

1, X, X: undefined, cannot be used

PCR0

PCR1

PCR2

PCR2, PCR1, PCR0: PB3~PB0 configurations

0, 0, 0: PB3 PB2 PB1 PB0 (The ADC circuit is power off to reduce power consumption.)

0, 0, 1: PB3 PB2 PB1 AN0

0, 1, 0: PB3 PB2 AN1 AN0

0, 1, 1: PB3 AN2 AN1 AN0

1, x, x: AN3 AN2 AN1 AN0

EOCB

End of A/D conversion flag.

(0: end of A/D conversion)

START

Start the A/D conversion

®1®0= Start

®1= Reset A/D converter and set EOCB to ²1²

ADCR (22H) Register

Bit No.

Label

Function

ADCS0

ADCS1

Select the A/D converter clock source.

0, 0: fSYS/2

0, 1: fSYS/8

1, 0: fSYS/32

1, 1: Undefined, cannot be used.

2~6

Unused bit, read as

²0².

TEST

For internal test only.

ACSR (23H) Register

t A D C 1

t A D C 2

A / D c o n v e r s i o n t i m e

t A D C 1

t A D C 2

A / D c o n v e r s i o n t i m e

0 0 0 B

1 0 0 B

0 1 0 B

0 0 0 B

S T A R T

E O C B

P C R 2 ~ P C R 0

A C S 2 ~ A C S 0

P o w e r - o n

R e s e t

E n d o f A / D

c o n v e r s i o n

1 : D e f i n e P B c o n f i g u r a t i o n

2 : S e l e c t a n a l o g c h a n n e l

1 . P B p o r t s e t u p a s I / O s

2 . A / D c o n v e r t e r i s p o w e r e d o f f

t o r e d u c e p o w e r c o n s u m p t i o n

A / D c l o c k m u s t b e f S Y S / 2 , f S Y S / 8 o r f S Y S / 3 2

t A D C 1 = 6 4 t A D f o r H T 4 6 R 4 6 / H T 4 6 C 4 6

t A D C 2 = 7 6 t A D f o r H T 4 6 R 4 7 / H T 4 6 C 4 7

t A D C S 1 = 3 2 t A D f o r H T 4 6 R 4 6 / H T 4 6 C 4 6

t A D C S 2 = 3 2 t A D f o r H T 4 6 R 4 7 / H T 4 6 C 4 7

N o t e :

S t a r t o f A / D

c o n v e r s i o n

R e s e t A / D

c o n v e r t e r

1 0 0 B

0 0 0 B

S t a r t o f A / D

c o n v e r s i o n

R e s e t A / D

c o n v e r t e r

A / D s a m p l i n g t i m e

t A D C S 1

t A D C S 2

M i n i m u m o n e i n s t r u c t i o n c y c l e n e e d e d

d o n ' t c a r e

A / D a m p l i n g t i m e

t A D C S 1

t A D C S 2

E n d o f A / D

c o n v e r s i o n

A/D Conversion Timing

HT46R46 Datasheet(PDF) 19 Page - Holtek Semiconductor Inc

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