Zilog Z8F0130 Instrukcja Użytkownika Pobierz pdf (Strona 124)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 BTJZ Instruction

109

BTJZ

Definition

Bit Test and Jump if Zero.

Syntax

BTJZ bit, src, DA

Operation

if src[bit] = 0 {





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 a logical 0. If the

selected bit is 0, 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. Multiple

bits cannot be tested simultaneously.

Table 23. BTJZ Operand Description

Bit Position Tested Operand[3:0]

Decimal Binary Binary Hexadecimal

0 000 0000 0

1 001 0001 1

2 010 0010 2

301100113

4 100 0100 4

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 313 314

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