Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 117)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 BTJ Instruction

102

BTJ

Definition

Bit Test and Jump.

Syntax

BTJ p, bit, src, DA

Operation

if src[bit] = p {





PC + X



}

In the operation above, the jump offset, X, is calculated by the eZ8 CPU

assembler from Program Counter value,

PC, 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 p flag. If the

bit in the source is equal to the polarity

p, the signed displacement, X, is

added to the Program Counter, which 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 21. BTJ Operand Description

Polarity Bit (p)

Bit Position Tested Operand[3:0]

Decimal Binary Binary Hexadecimal

0 0 000 0000 0

0 1 001 0001 1

0 2 010 0010 2

0301100113

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 313 314

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