HT85F2240 datasheet(31/147 Pages) HOLTEK

31 / 147 page

Rev. 1.10

�1 of 147

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

FMCR Register – Flash Program Memory Control Register

SFR Address: F8h

Bit

Name

FMCR.7

FMCR.6

—

FMCR.�

FMCR.1

FMCR.0

R/W

—

R/W

POR

—

Bit 7

FMCR.7: Flash Memory Read/Write/Erase enable control bit

0: Disable

1: Enable

As this bit is cleared automatically by hardware soon after a command is initiated, when

the MCU reads this bit it will always obtain a zero value.

Bit 6

FMCR.6: Flash Memory Byte Write/Page Erase control bit

0: For an un-written byte with a value of 0xFF within a page, a write operation is

allowed. But for those written bytes with any values except for 0xFF, a re-write

operation is prohibited to avoid Flash errors. The writing time is shorter.

1: Before the main program executes a byte write operation, a page erase operation

is automatically executed. Any location within the page is then rewritable, but the

write time is longer. Note that each of the security bytes 00h~1Fh in the ID block

page 0 can only be written once, the only method to release the protected bytes is

by “ICP Whole Chip Erase”.

Bit 5~3

Unimplemented, read as “0”.

Bit 2

FMCR.2: Flash Memory Page Erase control bit

0: Disable

1: Enable

This bit should be cleared using the application program.

Bit 1

FMCR.1: Flash Memory Byte Read control bit

0: Disable

1: Enable

This bit should be cleared using the application program.

Bit 0

FMCR.0: Flash Memory Byte Write control bit

0: Disable

1: Enable

This bit should be cleared using the application program.

Note that the valid combinations for FMCR.2~FMCR.0 are 100, 010 and 001, all other combinations

should be ignored.

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