COP8CCR9IMT7SLASHNOPB datasheet(93/111 Pages) TI1

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COP8CBR9, COP8CCR9, COP8CDR9

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SNOS535I – OCTOBER 2000 – REVISED MARCH 2013

A change in program flow requires a non-incremental change in the Program Counter contents. The

Program Counter consists of two bytes, designated the upper byte (PCU) and lower byte (PCL). The most

significant bit of PCU is not used, leaving 15 bits to address the program memory.

Different addressing modes are used to specify the new address for the Program Counter. The choice of

addressing mode depends primarily on the distance of the jump. Farther jumps sometimes require more

instruction bytes in order to completely specify the new Program Counter contents.

The available transfer-of-control addressing modes are:

•

Jump Relative

•

Jump Absolute

•

Jump Absolute Long

•

Jump Indirect

The transfer-of-control addressing modes are described below. Each description includes an example of a

Jump instruction using a particular addressing mode, and the effect on the Program Counter bytes of

executing that instruction.

Jump Relative. In this 1-byte instruction, six bits of the instruction opcode specify the distance of the jump

from the current program memory location. The distance of the jump can range from

−31 to +32. A JP+1

instruction is not allowed. The programmer should use a NOP instead.

Example:

Jump Relative

JP 0A

Contents

Reg

Before

After

PCU

02 Hex

PCL

05 Hex

0F Hex

Jump Absolute. In this 2-byte instruction, 12 bits of the instruction opcode specify the new contents of the

Program Counter. The upper three bits of the Program Counter remain unchanged, restricting the new

Program Counter address to the same 4-kbyte address space as the current instruction. (This restriction is

relevant only in devices using more than one 4-kbyte program memory space.)

Example:

Jump Absolute

JMP 0125

Contents

Reg

Before

After

PCU

0C Hex

01 Hex

PCL

77 Hex

25 Hex

Jump Absolute Long. In this 3-byte instruction, 15 bits of the instruction opcode specify the new contents

of the Program Counter.

Example:

Jump Absolute Long

JMP 03625

Reg/

Contents

Memory

Before

After

PCU

42 Hex

36 Hex

PCL

36 Hex

25 Hex

Functional Description

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COP8CCR9IMT7/NOPB Datasheet(PDF) 93 Page - Texas Instruments

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