Ez80 Cpu Status Indicators (Flag Register) - ZiLOG eZ80 User Manual

Table 5. CPU Register and Bit Flag Reset States
8-Bit Working Registers
Upper Bytes of 24-Bit Multibyte
Working Registers
8-Bit Control Registers
Upper Bytes of 24-Bit Multibyte
Control Registers
16- and 24-Bit Control Registers
Single-Bit Flags
®
eZ80 CPU Status Indicators (Flag Register)
The Flag register (F and F') contains status information for the CPU. The bit position for
each flag is indicated in
Table 6. Flag Register Bit Positions
Bit
Flag
UM007714-0908
Table 6.
7 6 5 4
S Z X H
CPU Register
or Bit Flag Reset State
A, A' Undefined
B, B' Undefined
C, C' Undefined
D, D' Undefined
E, E' Undefined
F, F' Undefined
H, H' Undefined
L, L' Undefined
BCU Undefined
DEU Undefined
HLU Undefined
I
IXH
IXL
IYH
IYL
MBASE
R
IXU
IYU
PC
000000h
SPS
SPL
000000h
ADL
IEF1
IEF2
MADL
3 2 1 0
X P/V N C
®
eZ80
User Manual
00h
00h
00h
00h
00h
00h
00h
00h
00h
0000h
0
0
0
0
Registers and Bit Flags
CPU
14