HT66F20 datasheet(201/298 Pages) HOLTEK

201 / 298 page

Rev. 1.90

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

Da ta

01010

S= St ar t (1 b it )

SA =S la ve A dd re ss (7 b it s)

SR =S RW b i t ( 1 bi t)

M= Sl av e dev ic e s end a ck now l edge bi t (1 b it )

D= Da ta ( 8 bi ts )

A= AC K ( RX AK b i t f or tr ans mi tte r, T XAK b i t f or r ec ei ve r 1 bi t)

P= St op (1 b it )

SC L

St ar t

SD A

SR W

AC K

St op

SC L

SD A

Sl av e Ad dr es s

SS AS R

Note:*Whenaslaveaddressismatched,thedevicesmustbeplacedineitherthetransmitmode

andthenwritedatatotheSIMDregister,orinthereceivemodewhereitmustimplementa

dummyreadfromtheSIMDregistertoreleasetheSCLline.

I2C Communication Timing Diagram

St ar t

HA AS= 1

HT X= 1

SR W= 1

Ye s

R XAK =1

Ye s

R ead fr om

SI MD t o re l eas e

SC L lin e

RE TI

Ye s

Du mm y r ead fr om

SI MD t o re l eas e

SC L Li ne

RE TI

Wr it e dat a to S IM D

re l eas e SC L Li ne

SE T HT X

Wr it e dat a to S IM D

to r el eas e SC L Li ne

RE TI

CL R HT X

CL R T XAK

Du mm y r ead fr om

SI MD t o re l eas e

SC L Li ne

CL R HT X

CL R TX AK

RE TI

I2C Bus ISR flow Chart

HT66F20 Datasheet(PDF) 201 Page - Holtek Semiconductor Inc

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