MSP430 datasheet(4/31 Pages) TI

4 / 31 page

General-Purpose Register

Program Counter

Stack Pointer

Status Register

Constant Generator

General-Purpose Register

PC/R0

SP/R1

SR/CG1/R2

CG2/R3

R12

R13

General-Purpose Register

R10

R11

General-Purpose Register

R14

R15

MSP430x11x

MIXED SIGNAL MICROCONTROLLERS

SLAS196D− DECEMBER 1998 − REVISED SEPTEMBER 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

short-form description

CPU

The MSP430 CPU has a 16-bit RISC architecture

that is highly transparent to the application. All

operations, other than program-flow instructions,

are

performed

operations

conjunction with seven addressing modes for

source operand and four addressing modes for

destination operand.

The CPU is integrated with 16 registers that

provide reduced instruction execution time. The

one cycle of the CPU clock.

Four of the registers, R0 to R3, are dedicated as

program counter, stack pointer, status register,

and

constant

generator

respectively.

The

remaining

registers

are

general-purpose

registers.

Peripherals are connected to the CPU using data,

address, and control buses, and can be handled

with all instructions.

instruction set

The instruction set consists of 51 instructions with

three formats and seven address modes. Each

instruction can operate on word and byte data.

Table 1 shows examples of the three types of

instruction formats; the address modes are listed

in Table 2.

Table 1. Instruction Word Formats

Dual operands, source-destination

e.g. ADD R4,R5

R4 + R5 −−−> R5

Single operands, destination only

e.g. CALL

PC −−>(TOS), R8−−> PC

Relative jump, un/conditional

e.g. JNE

Jump-on-equal bit = 0

Table 2. Address Mode Descriptions

ADDRESS MODE

SYNTAX

EXAMPLE

OPERATION

D D

MOV Rs,Rd

MOV R10,R11

R10

−−> R11

Indexed

D D

MOV X(Rn),Y(Rm)

MOV 2(R5),6(R6)

M(2+R5)−−> M(6+R6)

Symbolic (PC relative)

D D

MOV EDE,TONI

M(EDE) −−> M(TONI)

Absolute

D D MOV &MEM,&TCDAT

M(MEM) −−> M(TCDAT)

Indirect

MOV @Rn,Y(Rm)

MOV @R10,Tab(R6)

M(R10) −−> M(Tab+R6)

Indirect

autoincrement

MOV @Rn+,Rm

MOV @R10+,R11

M(R10) −−> R11

R10 + 2−−> R10

Immediate

MOV #X,TONI

MOV #45,TONI

#45

−−> M(TONI)

NOTE: S = source

D = destination

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