HT67F60 datasheet(225/242 Pages) HOLTEK

225 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

224

March 06 , 2012

Rev. 1.50

225

March 06 , 2012

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

where 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.

HT67F60 Datasheet(PDF) 225 Page - Holtek Semiconductor Inc

HT67F60 Datasheet(HTML) 225 Page - Holtek Semiconductor Inc

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