HT68F017 datasheet(21/116 Pages) HOLTEK

21 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

RAM Data Memory

The Data Memory is a volatile area of 8-bit wide RAM in-

ternal memory and is the location where temporary in-

formation is stored.

Structure

Divided into two sections, the first of these is an area of

RAM, known as the Special Function Data Memory. Here

are located registers which are necessary for correct op-

eration of the device. Many of these registers can be read

from and written to directly under program control, how-

ever, some remain protected from user manipulation.

Device

Capacity

Bank 0

Bank 1

HT66F016

HT68F016

´8

80H~BFH Unimplemented

HT66F017

HT68F017

128

´8

80H~FFH Unimplemented

General Purpose Data Memory Structure

The second area of Data Memory is known as the Gen-

eral Purpose Data Memory, which is reserved for gen-

eral purpose use. All locations within this area are read

and write accessible under program control.

The overall Data Memory is subdivided into two banks

for all the devices. The Special Purpose Data Memory

registers are accessible in all banks, with the exception

of the EEC register at address 40H, which is only acces-

sible in Bank 1. Switching between the different Data

Memory banks is achieved by setting the Bank Pointer

to the correct value. The start address of the Data Mem-

ory for all devices is the address 00H.

V D D

I C P M S

I C P D A

I C P C K

V S S

T o o t h e r C i r c u i t

P A 0

P A 2

V S S

P A 7

V D D

W r i t e r P i n s

M C U

P r o g r a m m i n g P i n s

Note:

* may be resistor or capacitor. The resistance

of * must be greater than 1k

W or the capacitance

of * must be less than 1nF.

G e n e r a l

P u r p o s e

D a t a M e m o r y

8 0 H

n F H

U n u s e d

B a n k 0

B a n k 1

N o t e : G e n e r a l P u r p o s e D a t a M e m o r y s p a c e :

8 0 H ~ B F H f o r H T 6 6 F 0 1 6 / H T 6 8 F 0 1 6

8 0 H ~ F F H f o r H T 6 6 F 0 1 7 / H T 6 8 F 0 1 7

General Purpose Data Memory

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