ZiLOG eZ80 User Manual

eZ80
®
CPU
User Manual
UM007714-0908 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 76543210
Flag SZXHXP/VNC

ZiLOG eZ80 Specifications

General

Brand	ZiLOG
Model	eZ80
Category	Computer Hardware
Language	English