Block Diagram

The following block diagram illustrates the dual-chip structure of the devices, where an individual

MCU and RF Transmitter devices are combined into a single package.

HT66F03T3/HT68F03T3

8-Bit Flash MCU with RF Transmitter

Rev. 1.30

3

July 4, 2011

F l a s h / E E P R O M

P r o g r a m m i n g

C i r c u i t r y ( I S P )

W a t c h d o g

T i m e r

8 - b i t

R I S C

M C U

C o r e

R e s e t

C i r c u i t

I n t e r r u p t

C o n t r o l l e r

E R C / H X T /

L I R E / L X T

O s c i l l a t o r s

1 2 - B i t A / D

C o n v e r t e r

H I R C

O s c i l l a t o r

E E P R O M

D a t a

M e m o r y

F l a s h

P r o g r a m

M e m o r y

R A M

D a t a

M e m o r y

T M 0

L o w

V o l t a g e

R e s e t

L o w

V o l t a g e

D e t e c t

T M 1

C o m p a r a t o r s

T B 0 / T B 1

I / O

R F

T r a n s m i t t e r

Note: The A/D Converter function only exists in the HT66F03T3 device.

R F M o d u l e

D I N

V S S

P A O U T

X O U T

X I N

A V S S

E N

P A 0 / C + / A N 0

P A 1 / C - / A N 1 / V R E F

P A 2 / C X / [ T P 0 ] / A N 2

P A 3 / I N T / T C K 1 / T P 0 / A N 3

P A 5 / [ T P 0 ] / O S C 2

P A 6 / [ T C K 0 ] / [ T P 1 ] / O S C 1

P A 7 / [ I N T ] / [ T C K 0 ] / [ T C K 1 ] / [ T P 1 ] / R E S

V D D

A V D D

P A 4 / T C K 0 / T P 1 / D O U T

C R E F

C R E F

H T 6 6 F 0 3

H T 6 8 F 0 3

Internal Chip Interconnection Diagram

Note: The AN0~AN3 and VREF shared-pin functions only exist in the HT66F03T3 device.