ZiLOG Z80380 User Manual page 175

Z
ILOG
Operation: PC (31-0)
This instruction is used to return to a previously executing procedure at the end of a
breakpoint. The contents of the Shadow Program Counter (SPC), which holds the address
of the next instruction of the previously executing procedure, are loaded into the Program
Counter (PC).
Note that maskable interrupts (if IEF1 is set) and non-maskable interrupt are enabled after
the instruction following RETB is executed.
Flags: S: Unaffected
Z: Unaffected
H: Unaffected
V: Unaffected
N: Unaffected
C: Unaffected
Addressing
Mode Syntax
RETB
DC-8297-03
← SPC (31-0)
Instruction Format
11101101 01010101
RETURN FROM BREAKPOINT
Execute
Time Note
2
™
Z380
U ' M
SER S ANUAL
RETB
5-141