Zilog Z8F0130 - Manual (Page 255)

eZ8
™
CPU Core
User Manual
UM012820-0810 TCM Instruction
240
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address modes R or IR specify a work-
ing register. If the high nibble of the source or destination address is
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 R3 contains the value 45h ( 01000101b ) and Work-
ing Register R7 contains the value 01h ( 00000001b ) (testing bit 0 if it is
1), the following statement sets the Z flag indicating bit 0 in the destina-
tion operand is 1 and clears the V and S flags:
TCM R3, R7

Object Code: 62 37
If Working Register R14 contains the value F3h ( 11110011b ), Working
Register R5 contains the value CBh , and Register CBh contains the value
88h ( 10001000b ; testing bits 7 and 3 if they are 1), the following state-
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
TCM r1, r2 62 {r1, r2} — —
TCM r1, @r2 63 {r1, r2} — —
TCM R1, R2 64 R2 R1 —
TCM R1, @R2 65 R2 R1 —
TCM R1, IM 66 R1 IM —
TCM @R1, IM 67 R1 IM —