ZiLOG eZ80

eZ80
®
CPU
User Manual
UM007714-0908 CPU Instruction Set
301
Condition Bits Affected
None.
0 . L The MADL control bit must be set to 1 to enable mixed-
ADL mode interrupts. The starting Program Counter is
{MBASE, PC[15:0]}. Pop a byte from SPL into ADL to
set the new memory mode (03h = ADL, 02h = Z80).
if ADL mode {
Pop the upper byte of the return address from SPL into
PC[23:16].
Pop 2 LS bytes of the return address from {MBASE, SPS}
into PC[15:0]. The ending Program Counter is PC[23:0]
}
else Z80 mode {
Pop a 2-byte return address from {MBASE,SPS} into
PC[15:0]. The ending Program Counter is {MBASE,
PC[15:0]}.
}
1 .L The MADL control bit must be set to 1 to enable mixed-
ADL mode interrupts The starting Program Counter is
PC[23:0].
Pop a byte from SPL into ADL to set the new memory
mode (03h = ADL, 02h = Z80).
if ADL mode {
Pop 3-byte return address from SPL into PC[23:0]. The
ending Program Counter is PC[23:0]
}
else Z80 mode {
Pop a 2-byte return address from SPL into PC[15:0]. The
ending Program Counter is {MBASE, PC[15:0]}.
}
Table 87. RETN Instruction Detail (Continued)
ADL Suffix Operation