Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 121)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 BTJNZ Instruction

106

BTJNZ

Definition

Bit Test and Jump if Non-Zero.

Syntax

BTJNZ bit, src, DA

Operation

if src[bit] = 1 {





PC + X



}

where the jump offset, X, is calculated by the eZ8 CPU assembler from

the Program Counter (PC) value and the Destination Address (DA).

Description

For this new eZ8 instruction, the selected bit in the source operand or reg-

ister pointed to by the source operand is compared with the a logical 1. If

the selected bit is 1, the signed destination displacement (X) is added to

the Program Counter, that causes a jump. The displacement value can be

from –128 to +127. This instruction tests only a single bit position. Multi-

ple bits cannot be tested simultaneously.

Table 22. BTJNZ Operand Description

Bit Position Tested Operand[3:0]

Decimal Binary Binary Hexadecimal

0 000 1000 8

1 001 1001 9

2 010 1010 A

3 011 1011 B

4 100 1100 C

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 313 314

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