HT85F2270 datasheet(40/226 Pages) HOLTEK

40 / 226 page

Rev. 1.00

40 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

Byte Write Operation

The Flash Memory must be first unlocked before implementing a Byte Write procedure. The first

step is to assign the target memory page and erase it. Refer to the Page Erase Operation section

for details. The Flash Memory Byte Write function is controlled by the control bits, FMCR.0 and

FMCR.6, in the FMCR register. Data is first written into the FMDR register to update the Page

Buffer. The Flash memory will check if the memory address has reached the page boundary. If the

boundary has been reached or there is no more data, then set the FMCR.0 bit to high to enable the

Byte Write function. When the FMCR.7 bit is set high the Byte Write procedure will be executed.

When the procedure is ready, the MCU will continue to run automatically. The following flowchart

illustrates the Byte Write procedure.

START

�CU waits for memor�

dump finished and then

�CU continues to run.

Flash memor� controller

must be In unlocked state

Write F�AR�

Write F�AR1

Write F�AR0

F�CR Bit 0 = 1 and

F�CR Bit 6 = 0 (*)

Enter memor�

dump procedure

Write next page

if desired

�CU waits for b�te-writing

finished and then

�CU continues to run.

F�CR Bit 7 = 1

Update the Page Buffer

B� writing F�DR

F�ARx reach the

page boundar�?

�ore Data?

Yes

Check F�SR Bit 1 = 1

Yes

Byte Write Flowchart (FMCR.0=1, FMCR.6=0)

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