Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller BGA 113 MicroStar Junior (7x7) 16-Bit 16 MHz I/O number 64

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

MSP430F261x

MSP430F241x

SLAS541K –JUNE 2007–REVISED NOVEMBER 2012

www.ti.com

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 as register operations in 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 register-to-

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 3 shows examples of the three types of

instruction formats; Table 4 shows the address

modes.

Table 3. Instruction Word Formats

INSTRUCTION FORMAT EXAMPLE OPERATION

Dual operands, source-destination ADD R4,R5 R4 + R5 -> R5

Single operands, destination only CALL R8 PC ->(TOS), R8-> PC

Relative jump, un/conditional JNE Jump-on-equal bit = 0

Table 4. Address Mode Descriptions

ADDRESS MODE S

(1)

SYNTAX EXAMPLE OPERATION

Indexed ✓ ✓ MOV X(Rn),Y(Rm) MOV 2(R5),6(R6) M(2+R5)-> M(6+R6)

Symbolic (PC relative) ✓ ✓ MOV EDE,TONI M(EDE) -> M(TONI)

Absolute ✓ ✓ MOV &MEM,&TCDAT M(MEM) -> M(TCDAT)

Indirect ✓ MOV @Rn,Y(Rm) MOV @R10,Tab(R6) M(R10) -> M(Tab+R6)

M(R10) -> R11

Indirect autoincrement ✓ MOV @Rn+,Rm MOV @R10+,R11

R10 + 2-> R10

Immediate ✓ MOV #X,TONI MOV #45,TONI #45 -> M(TONI)

(1) S = source, D = destination