Z8F0830HH020SG Datasheet, PDF (130/257 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore!^® F0830 Series
Product Specification
112
Flash information area is mapped into program memory and overlays the 128 bytes in the
address range FE00H to FE7FH. When the information area access is enabled, all reads
from these program memory addresses return the information area data rather than the
program memory data. Access to the Flash information area is read-only.
The trim bits are handled differently than the other Zilog Flash option bits. The trim bits
are the hybrid of the user option bits and the standard Zilog option bits. These trim bits
must be user-accessible for reading at all times using external registers regardless of the
state of bit 7 in the Flash Page Select Register. Writes to the trim space change the value of
the Option Bit Holding Register but do not affect the Flash bits, which remain as read-
only.
Table 70. Z8F083 Flash Memory Area Map
Program Memory
Address (Hex)
FE00–FE3F
FE40–FE53
FE54–FE5F
FE60–FE7F
Function
Zilog option bits
Part number
20-character ASCII alphanumeric code
Left justified and filled with FH
Reserved
Reserved
Operation
The Flash Controller programs and erases Flash memory. The Flash Controller provides
the proper Flash controls and timing for byte programming, page erase and mass erase of
Flash memory.
The Flash Controller contains several protection mechanisms to prevent accidental pro-
gramming or erasure. These mechanism operate on the page, sector and full-memory lev-
els.
The flowchart in Figure 19 display basic Flash Controller operation. The following sub-
sections provide details about the various operations (Lock, Unlock, Byte Programming,
Page Protect, Page Unprotect, Page Select Page Erase and Mass Erase) displayed in
Figure 19.
PS025113-1212
Operation