Z8FMC16100 Series Flash MCU
Product Specification
217
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The Flash Write Protect option bit is ignored
The Flash Sector Protect Register is ignored for programming and erase operations
Programming operations are not limited to the page selected in the Page Select Register
Bits in the Flash Sector Protect Register can be written to one or zero
The second write of the Page Select Register to unlock the Flash Controller is not nec-
essary
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The Page Select Register can be written when the Flash Controller is unlocked
The Mass Erase command is enabled through the Flash Control Register
The page erase and programming operations are disabled if the Memory Read Protect
option is enabled
Flash Control Register
The Flash Control Register, shown in Table 116, unlocks the Flash Controller for pro-
gramming and erase operations, or to select the Flash Sector Protect Register.
The Write-Only Flash Control Register shares its Register File address with the Read-
Only Flash Status Register.
Table 116. Flash Control Register (FCTL)
BITS
FIELD
RESET
R/W
7
6
5
4
3
2
1
0
FCMD
00H
W
FF8H
ADDR
Bit
Value
Description
Position
[7:0]
Flash Command:
FCMD
73H
8CH
95H
63H
5EH
First unlock command.
Second unlock command.
Page erase command.
Mass erase command.
Flash Sector Protect register select.
All other commands, or any command out of sequence, locks the Flash
Controller.
PS024604-1005
P R E L I M I N A R Y
Flash Control Register
ZILOG [ ZILOG, INC. ]
