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HT66FM5440
Brushless DC Motor A/D Flash MCU
HT66FM5440
Brushless DC Motor A/D Flash MCU
Flash Program Memory
The Program Memory is the location where the user code or program is stored. For the 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, the Flash device offer
s
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. 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.
000H
Initialisation Vector
004H
FFFH
16 bits
Interr�pt Vectors
03CH
Look-�p Table
n00H
nFFH
Program Memory Structure
Special Vectors
Within the Program Memory, certain locations are reserved for the reset and interrupts. The location
000
H 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-up Table
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 corresponding table read instruction such as "TABRD [m]" or "TABRDL [m]" respectively when
the memory [m] is located in sector 0. If the memory [m] is located in other sectors, the data can be
retrieved from the program memory using the corresponding extended table read instruction such as
"LTABRD [m]" or "LTABRDL [m]" respectively. When the instruction is executed, the lower order
table byte from the Program Memory will be transferred to the user defined Data Memory register [m]
as specified in the instruction. The higher order table data byte from the Program Memory will be
transferred to the TBLH special register.