Zilog EZ80F916 - Manual (Page 23)

eZ80
®
CPU
User Manual
UM007715-0415 Registers and Bit Flags
14
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 .
Table 5. CPU Register and Bit Flag Reset States
CPU Register
or Bit Flag Reset State
8-Bit Working Registers A, A’ Undefined
B, B’ Undefined
C, C’ Undefined
D, D’ Undefined
E, E’ Undefined
F, F’ Undefined
H, H’ Undefined
L, L’ Undefined
Upper Bytes of 24-Bit Multibyte
Working Registers
BCU Undefined
DEU Undefined
HLU Undefined
8-Bit Control Registers I
00h
IXH
00h
IXL
00h
IYH
00h
IYL
00h
MBASE
00h
R
00h
Upper Bytes of 24-Bit Multibyte
Control Registers
IXU
00h
IYU
00h
16- and 24-Bit Control Registers PC
000000h
SPS
0000h
SPL
000000h
Single-Bit Flags ADL
0
IEF1
0
IEF2
0
MADL
0
Table 6. Flag Register Bit Positions
Bit 7 6 5 4 3 2 1 0
Flag
S Z X H X P/V N C