ZiLOG Z8 Series User Manual

Z8
®
CPU
User Manual
UM001604-0108 Instruction Description
192
Address modes R or IR can be used to specify a 4-bit Working Register. In this format, the
source or destination Working Register operand is specified by adding
1110b (Eh) to the
high nibble of the operand. For example, if Working Register R12 (CH) is the destination
operand, then
ECh is used as the destination operand in the Op Code.
Example 1
The statement:
LD R15, #34h
Op Code: FC 34
loads the value 34h into Working Register R15.
Example 2
If Register 34h contains the value FCh, the statement:
LD R14, 34h
Op Code: F8 34
loads the value FCh into Working Register R15. The contents of Register 34h are not
affected.
Example 3
If Working Register R14 contains the value 45h, the statement:
LD 34h, R14
Op Code: E9 34
loads the value 45h into Register 34h. The contents of Working Register R14 are not
affected.
Example 4
If Working Register R12 contains the value 34h, and Register 34h contains the value FFh,
the statement:
LD R13, @R12
Op Code: E3 DC
loads the value FFh into Working Register R13. The contents of Working Register R12
and Register R34 are not affected.
Example 5
If Working Register R13 contains the value 45h, and Working Register R12 contains the
value
00h the statement:
LD @R13, R12
Op Code: F3 DC
Esrcor Edst
Note:

ZiLOG Z8 Series Specifications

General

Brand	ZiLOG
Model	Z8 Series
Category	Microcontrollers
Language	English