HT66F13 datasheet(21/173 Pages) HOLTEK

21 / 173 page

FlashProgramMemory

The Program Memory is the location where the user code or program is stored. For this device series

the Program Memory is Flash type, which means it can be programmed and re-programmed a large

number of times, allowing the user the convenience of code modification on the same device. By using

the appropriate programming tools, these Flash devices offer users the flexibility to conveniently

debug and develop their applications while also offering a means of field programming and updating.

Structure

The Program Memory has a capacity of 1K

´14 bits to 4K´15 bits. The Program Memory is addressed

by the Program Counter and also contains data, table information and interrupt entries. Table data,

which can be setup in any location within the Program Memory, is addressed by a separate table

pointer register.

Device

Capacity

HT66F20

´14

HT66F30

´15

HT66F40

´15

SpecialVectors

Within the Program Memory, certain locations are reserved for the reset and interrupts. The location

000H is reserved for use by the device reset for program initialisation. After a device reset is initiated,

the program will jump to this location and begin execution.

Look-upTable

Any location within the Program Memory can be defined as a look-up table where programmers can

store fixed data. To use the look-up table, the table pointer must first be setup by placing the address of

the look up data to be retrieved in the table pointer register, TBLP and TBHP. These registers define the

total address of the look-up table.

After setting up the table pointer, the table data can be retrieved from the Program Memory using the

²TABRD[m]² or ²TABRDL[m]² instructions, respectively. When the instruction is executed, the

lower order table byte from the Program Memory will be transferred to the user defined Data Memory

will be transferred to the TBLH special register. Any unused bits in this transferred higher order byte

will be read as

²0².

Rev.1.10

February9,2011

HT66F13/HT66F14/HT66F15

EnhancedA/DFlashType MCU

I n t e r r u p t

V e c t o r

0 0 0 4 H

0 3 F F H

1 4 b i t s

0 0 1 C H

I n t e r r u p t

V e c t o r

1 5 b i t s

0 7 F F H

I n t e r r u p t

V e c t o r

1 5 b i t s

R e s e t

0 0 0 0 H

H T 6 6 F 1 3

R e s e t

H T 6 6 F 1 4

R e s e t

H T 6 6 F 1 5

0 F F F H

ProgramMemoryStructure

HT66F13 Datasheet(PDF) 21 Page - Holtek Semiconductor Inc

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