Z8F6421PM020SC Datasheet, PDF (205/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
185
Flash Control Register Definitions
Flash Control Register
The Flash Control register (Table 91) unlocks the Flash Controller for programming 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 91. Flash Control Register (FCTL)
BITS
7
6
5
4
3
2
1
0
FIELD
RESET
R/W
ADDR
FCMD
0
W
FF8H
FCMD—Flash Command
73H = First unlock command.
8CH = Second unlock command.
95H = Page erase command.
63H = Mass erase command
5EH = Flash Sector Protect register select.
* All other commands, or any command out of sequence, lock the Flash Controller.
PS019915-1005
Flash Memory