Zilog Z8F0130 - Manual (Page 225)

eZ8
™
CPU Core
User Manual
UM012820-0810 RL Instruction
210
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address modes R or IR specify a work-
ing register. If the destination address is prefixed by
Eh ( 1110b ), a work-
ing register is inferred. For example, if Working Register R12 ( Ch ) is the
preferred destination operand, use ECh as the destination operand in the
Op Code. To access registers with addresses E0h to EFh , either set the
Working Group Pointer, RP[7:4] , to Eh or use indirect addressing.
Sample Usage
If Register C6h contains the value 88h ( 10001000b ), the following state-
ment leaves the value 11h ( 00010001b ) in Register C6h ., sets the C and
V flags and clears the S and Z flags:
RL C6h

Object Code: 90 C6
If the contents of Register C6h are 88h , and the contents of Register 88h
are 44h ( 01000100b ), the following statement leaves the value 88h in
Register 88h ( 10001000b ), sets the S and V flags and clears the C and Z
flags:
RL @C6h

Object Code: 91 C6
Mnemonic Destination
Op Code
(Hex)
Operand 1 Operand 2 Operand 3
RL R1 90 R1 — —
RL @R1 91 R1 — —