Flash Program Memory; St�Uctu�E; Special Vecto�S - Holtek HT66F488 Manual

HT66F488/HT66F489
A/D Flash MCU with EEPROM

Flash Program Memory

The Program Memory is the location where the user code or program is stored. For this device 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, this Flash device offers 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 4K×16 bits to 8K×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.
Special Vectors
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.
Rev. 1.21
Device
HT66F488
HT66F48�
HT66F488
0000H
Reset
0004H
Interrupt Vector
003CH
16 bits
0FFFH
Program Memory Structure
21
Capacity
4K×16
8K×16
HT66F489
0000H
Reset
0004H
Interrupt Vector
003CH
1FFFH 16 bits
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