Zilog Z8F0130 - Manual (Page 119)

eZ8
™
CPU Core
User Manual
UM012820-0810 BTJ Instruction
104
Attributes
Sample Usage
If Working Register R7 contains the value 20h ( 00100000b ), the BTJ
instruction that begins with the following code segment:
It does not cause a Program Counter jump to occur because bit 5 of Work-
ing Register R7 fails the test for a 0. The next instruction executed after
the BTJ is the HALT instruction. The flags are unaffected.
If Working Register R7 contains the value A5h , and register A5h contains
the value 20h ( 00100000b ), the BTJ instruction that begins the follow-
ing code segment causes a Program Counter jump to occur because bit 5
of Register
A5h passes the test for a 1.
Mnemonic
Polarity, Bit,
Source,
Address Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
BTJ p, bit, r2, DA F6 {p, bit[2:0],
r2} X —
BTJ p, bit, @r2,
DA F7 {p, bit[2:0],
r2} X —
Assembly Code Object Code
BTJ 0, 5, r7, NEXT F6 57 01
HALT 7F
NEXT: This label is not assembled, but used by the
assembler to identify the destination address
(the address of the next instruction)
LD r0, @r2 E3 02