HT49RA1 datasheet(2/58 Pages) HOLTEK

2 / 58 page

Block Diagram

Note:

This block diagram represents the OTP devices, for the mask devices there is no Device Programming

Circuitry.

HT49RA1/HT49CA1

Rev. 1.00

May 7, 2008

S t a c k

D a t a

M e m o r y

I / O

P o r t s

T i m e r s

W a t c h d o g

T i m e r

O T P

P r o g r a m

M e m o r y

8 - b i t

R I S C

M C U

C o r e

W a t c h d o g

T i m e r O s c i l l a t o r

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

L o w

V o l t a g e

R e s e t

R C S y s t e m

O s c i l l a t o r

O T P

P r o g r a m m i n g

C i r c u i t r y

C a r r i e r

G e n e r a t o r

L C D

D r i v e r

Device Types

Devices which have the letter

²R² within their part number, indicate that they are OTP devices offering the advantages

of easy and effective program updates, using the Holtek range of development and programming tools. These devices

provide the designer with the means for fast and low-cost product development cycles. Devices which have the letter

²C² within their part number indicate that they are mask version devices. These devices offer a complementary device

for applications that are at a mature state in their design process and have high volume and low cost demands.

Fully pin and functionally compatible with their OTP sister devices, the mask version devices provide the ideal substi-

tute for products which have gone beyond their development cycle and are facing cost-down demands.

In this datasheet, for convenience, when describing device functions, only the OTP types are mentioned by name,

however the same described functions also apply to the Mask type devices.

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