HT45F0057 datasheet(72/88 Pages) HOLTEK

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HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

Logical and Rotate Operation

The standard logical operations such as AND, OR, XOR and CPL all have their own instruction

within the Holtek microcontroller instruction set. As with the case of most instructions involving

data manipulation, data must pass through the Accumulator which may involve additional

programming steps. In all logical data operations, the zero flag may be set if the result of the

operation is zero. Another form of logical data manipulation comes from the rotate instructions such

as RR, RL, RRC and RLC which provide a simple means of rotating one bit right or left. Different

rotate instructions exist depending on program requirements. Rotate instructions are useful for serial

port programming applications where data can be rotated from an internal register into the Carry

bit from where it can be examined and the necessary serial bit set high or low. Another application

which rotate data operations are used is to implement multiplication and division calculations.

Branches and Control Transfer

Program branching takes the form of either jumps to specified locations using the JMP instruction

or to a subroutine using the CALL instruction. They differ in the sense that in the case of a

subroutine call, the program must return to the instruction immediately when the subroutine has

been carried out. This is done by placing a return instruction “RET” in the subroutine which will

cause the program to jump back to the address right after the CALL instruction. In the case of a JMP

instruction, the program simply jumps to the desired location. There is no requirement to jump back

to the original jumping off point as in the case of the CALL instruction. One special and extremely

useful set of branch instructions are the conditional branches. Here a decision is first made regarding

the condition of a certain data memory or individual bits. Depending upon the conditions, the

program will continue with the next instruction or skip over it and jump to the following instruction.

These instructions are the key to decision making and branching within the program perhaps

determined by the condition of certain input switches or by the condition of internal data bits.

Bit Operations

The ability to provide single bit operations on Data Memory is an extremely flexible feature of all

Holtek microcontrollers. This feature is especially useful for output port bit programming where

individual bits or port pins can be directly set high or low using either the “SET [m].i” or “CLR [m].i”

instructions respectively. The feature removes the need for programmers to first read the 8-bit output

port, manipulate the input data to ensure that other bits are not changed and then output the port with

the correct new data. This read-modify-write process is taken care of automatically when these bit

operation instructions are used.

Table Read Operations

Data storage is normally implemented by using registers. However, when working with large

amounts of fixed data, the volume involved often makes it inconvenient to store the fixed data in

the Data Memory. To overcome this problem, Holtek microcontrollers allow an area of Program

Memory to be setup as a table where data can be directly stored. A set of easy to use instructions

provides the means by which this fixed data can be referenced and retrieved from the Program

Memory.

Other Operations

In addition to the above functional instructions, a range of other instructions also exist such as

the “HALT” instruction for Power-down operations and instructions to control the operation of

the Watchdog Timer for reliable program operations under extreme electric or electromagnetic

environments. For their relevant operations, refer to the functional related sections.

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