HT67F60 datasheet(32/242 Pages) HOLTEK

32 / 242 page

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

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

Fe tc h In st . 1E xe cu te I ns t . 1

Fe tc h In st . 2

Fl us h Pi pel in e

6 DE LA Y:

MO V A, [1 2H ]

CA LL D EL AY

CP L [ 12H ]

NO P

Ex ec ut e In st . 2

Fe tc h In st . 3

Fe tc h In st . 6

Ex ec ut e In s t. 6

Fe tc h In st . 7

Instruction Fetching

Program Counter

During program execution, the Program Counter is used to keep track of the address of the next

instruction to be executed. It is automatically incremented by one each time an instruction is

executed except for instructions, such as “JMP” or “CALL” that demand a jump to a non-

consecutive Program Memory address. Only the lower 8 bits, known as the Program Counter Low

When executing instructions requiring jumps to non-consecutive addresses such as a jump

instruction, a subroutine call, interrupt or reset, etc., the microcontroller manages program control

by loading the required address into the Program Counter. For conditional skip instructions, once the

condition has been met, the next instruction, which has already been fetched during the present

instruction execution, is discarded and a dummy cycle takes its place while the correct instruction is

obtained.

Device

Program Counter

High Byte

PCL Register

HT67F30

PC10~PC8

PCL7~PCL0

HT67F40

PC11~PC8

HT67F50

PC12~PC8

HT67F60

PC13~PC8

Program Counter

The lower byte of the Program Counter, known as the Program Counter Low register or PCL, is

available for program control and is a readable and writeable register. By transferring data directly into

this register, a short program jump can be executed directly, however, as only this low byte is available

for manipulation, the jumps are limited to the present page of memory, that is 256 locations. When

such program jumps are executed it should also be noted that a dummy cycle will be inserted.

Manipulating the PCL register may cause program branching, so an extra cycle is needed to pre-fetch.

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