HT45F0057 datasheet(13/81 Pages) HOLTEK

13 / 81 page

Rev. 1.30

May 17, 2022

Rev. 1.30

May 17, 2022

HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

Table Program Example

The following example shows how the table pointer and table data is defined and retrieved from the

microcontroller. This example uses raw table data located in the Program Memory which is stored

there using the ORG statement. The value at this ORG statement is “0F00H” which refers to the

start address of the last page within the 4K Program Memory of the device. The table pointer is

setup here to have an initial value of “06H”. This will ensure that the first data read from the data

table will be at the Program Memory address “0F06H” or 6 locations after the start of the last page.

Note that the value for the table pointer is referenced to the first address of the present page if the

“TABRDC [m]” instruction is being used. The high byte of the table data which in this case is equal

to zero will be transferred to the TBLH register automatically when the “TABRDC [m]” instruction

is executed.

Because the TBLH register is a read-only register and cannot be restored, care should be taken

to ensure its protection if both the main routine and Interrupt Service Routine use table read

instructions. If using the table read instructions, the Interrupt Service Routines may change the

value of the TBLH and subsequently cause errors if used again by the main routine. As a rule it is

recommended that simultaneous use of the table read instructions should be avoided. However, in

situations where simultaneous use cannot be avoided, the interrupts should be disabled prior to the

execution of any main routine table-read instructions. Note that all table related instructions require

two instruction cycles to complete their operation.

Table Read Program Example

tempreg1 db ?

; temporary register #1

tempreg2 db ?

; temporary register #2

mov a, 06h

; initialise low table pointer - note that this address is

; referenced

mov tblp, a

; to the last page or present page

tabrdc tempreg1

; transfers value in table referenced by table pointer data at

; program memory address 0F06H transferred to tempreg1 and TBLH

dec tblp

; reduce value of table pointer by one

tabrdc tempreg2

; transfers value in table referenced by table pointer data at

; program memory address 0F05H transferred to tempreg2 and TBLH

; in this example the data 1AH is transferred to tempreg1 and data

; 0FH to register tempreg2

org 0F00h

; sets initial address of program memory

dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

In Circuit Programming – ICP

The provision of Flash type Program Memory provides the user with a means of convenient and easy

upgrades and modifications to their programs on the same device. As an additional convenience,

Holtek has provided a means of programming the microcontroller in-circuit using a 4-pin interface.

This provides manufacturers with the possibility of manufacturing their circuit boards complete with

a programmed or un-programmed microcontroller, and then programming or upgrading the program

at a later stage. This enables product manufacturers to easily keep their manufactured products

supplied with the latest program releases without removal and re-insertion of the device.

The Holtek Flash MCU to Writer Programming Pin correspondence table is as follows:

HT45F0057 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

HT45F0057 Datasheet(HTML) 13 Page - Holtek Semiconductor Inc

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