Z8F6421PM020SC Datasheet, PDF (62/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Z8 Encore!
42
Flash Status
FSTAT (FF8H - Read Only)
D7 D6 D5 D4 D3 D2 D1 D0
Flash Controller Status
00_0000 = Flash controller locked
00_0001 = First unlock received
00_0010 = Second unlock received
00_0011 = Flash controller unlocked
00_0100 = Flash Sector Protect register
selected
00_1xxx = Programming in progress
01_0xxx = Page erase in progress
10_0xxx = Mass erase in progress
Reserved
Page Select
FPS (FF9H - Read/Write)
D7 D6 D5 D4 D3 D2 D1 D0
Page Select [6:0]
Identifies the Flash memory page for
Page Erase operation.
Information Area Enable
0 = Information Area access is disabled
1 = Information Area access is enabled
Flags
FLAGS (FFC - Read/Write)
D7 D6 D5 D4 D3 D2 D1 D0
F1 - User Flag 1
F2 - User Flag 2
H - Half Carry
D - Decimal Adjust
V - Overflow Flag
S - Sign Flag
Z - Zero Flag
C - Carry Flag
Register Pointer
RP (FFDH - Read/Write)
D7 D6 D5 D4 D3 D2 D1 D0
Working Register Page Address [11:8]
Working Register Group Address [7:4]
Flash Sector Protect
FPROT (FF9H - Read/Write to 1’s)
D7 D6 D5 D4 D3 D2 D1 D0
Flash Sector Protect [7:0]
0 = Sector can be programmed or
erased from user code
1 = Sector is protected and cannot be
programmed or erased from user
code
Flash Frequency High Byte
FFREQH (FFAH - Read/Write)
D7 D6 D5 D4 D3 D2 D1 D0
Flash Frequency value [15:8]
Stack Pointer High Byte
SPH (FFEH - Read/Write)
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer [15:8]
Stack Pointer Low Byte
SPL (FFFH - Read/Write)
D7 D6 D5 D4 D3 D2 D1 D0
Stack Pointer [7:0]
Flash Frequency Low Byte
FFREQL (FFBH - Read/Write)
D7 D6 D5 D4 D3 D2 D1 D0
Flash Frequency value [7:0]
PS019915-1005
Control Register Summary