HT85F2270 datasheet(35/226 Pages) HOLTEK

35 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

FMCR Register – Flash Program Memory Control Register

SFR Address: F8h

Bit

Name

F�CR.7

F�CR.6

—

F�CR.�

F�CR.1

F�CR.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 (0xFF) within a page, a write operation is allowed. But for

those written bytes (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 the security bytes 00h~1Fh in the ID block page 0

can only be written once.

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 manually.

Bit 1

FMCR.1: Flash Memory Byte Read control bit

0: Disable

1: Enable

This bit should be cleared manually.

Bit 0

FMCR.0: Flash Memory Byte Write control bit

0: Disable

1: Enable

This bit should be cleared manually.

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