Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 119)

100

101

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

Code

(Hex) Operand 1 Operand 2 Operand 3

BTJ p, bit, r2, DA F6 {p, bit[2:0],

r2}

X—

BTJ p, bit, @r2,

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

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 313 314

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