Z8F6421PM020SC Datasheet, PDF (208/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
188
Flash Sector Protect Register
The Flash Sector Protect register (Table 94) protects Flash memory sectors from being
programmed or erased from user code. The Flash Sector Protect register shares its Regis-
ter File address with the Page Select register. The Flash Sector protect register can be
accessed only after writing the Flash Control register with 5EH.
User code can only write bits in this register to 1 (bits cannot be cleared to 0 by user code).
Table 94. Flash Sector Protect Register (FPROT)
BITS
FIELD
7
SECT7
6
SECT6
5
SECT5
4
SECT4
3
SECT3
2
SECT2
1
SECT1
RESET
R/W
ADDR
0
R/W1
FF9H
R/W1 = Register is accessible for Read operations. Register can be written to 1 only (via user code).
0
SECT0
SECTn—Sector Protect
0 = Sector n can be programmed or erased from user code.
1 = Sector n is protected and cannot be programmed or erased from user code.
* User code can only write bits from 0 to 1.
PS019915-1005
Flash Memory