Flash Program Memory - Holtek HT66F20-1 Manual

Flash Program Memory

The Program Memory is the location where the user code or program is stored. For these devices
series the Program Memory are 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×16 bits to 2K×16 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
HT��F�0-1 / HT�8F�0-1
HT��F�0-1 / HT�8F�0-1
Special Vectors
Within the Program Memory, certain locations are reserved for the reset and interrupts. The location
000H is reserved for use by these devices reset for program initialisation. After a device reset is
initiated, the program will jump to this location and begin execution.
Rev. 1.40
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Capacity
×
1K 1�
×
�K 1�
H T 6 6 F 2 0 - 1 H T 6 6 F 3 0 - 1
H T 6 6 F 3 0 - 1 H T 6 8 F 3 0 - 1
0 0 0 H R e s e t R e s e t
0 0 4 H
I n t e r r u p t I n t e r r u p t
V e c t o r V e c t o r
0 2 C H
1 6 b i t s
3 F F H
1 6 b i t s
7 F F H
Program Memory Structure
�� �ove��e� ��� �01�