Zilog Z8F0130 - Manual (Page 240)

eZ8
™
CPU Core
User Manual
UM012820-0810 SRA Instruction
225
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address modes R or IR can specify a
working register. If the destination address is prefixed by
Eh ( 1110b ), a
working 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 Working Register R6 contains the value 31h ( 00110001b ), the follow-
ing statement leaves the value 18h ( 00011000b ) in Working Register R6,
sets the Carry flag, and clears the Z, V, and S flags:
SRA R6

Object Code: D0 E6
If Register C6h contains the value DFh , and Register DFh contains the
value B8h ( 10111000b ), the following statement leaves the value DCh
( 11011100b ) in Register DFh , resets the C, Z and V flags and sets the S
flag:
SRA @C6h

Object Code: D1 C6
Mnemonic Destination
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
SRA R1 D0 R1 — —
SRA @R1 D1 R1 — —