Texas Instruments MSP50C614 manual RPT Repeat Next Instruction, Load src to repeat counter

Models: MSP50C614

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Individual Instruction Descriptions

4.14.60 RPT

Repeat Next Instruction

 

 

 

 

 

Syntax

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[label]

name

src

Clock, clk

Word, w

With RPT, clk

Class

 

 

 

 

 

 

 

 

 

 

 

RPT

{adrs}8

Table 4±46

 

N/R

5

 

 

RPT

imm8

1

 

1

N/R

9b

Execution

IF RPT {adrs}8

 

 

 

 

 

load src to repeat counter.

ELSE

load imm8 to repeat counter.

(mask interrupt)

repeat next instruction (repeat counter value + 2) times. PC PC + w (next instruction)+1

Flags Affected

None

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Opcode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Instructions

 

16

15

14

13

12

11

10

9

8

7

6

5

4

 

3

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RPT {adrs}8

 

1

1

0

1

1

1

1

1

0

 

 

 

 

adrs

 

 

 

 

RPT imm8

 

1

1

1

1

1

1

0

0

0

 

 

 

 

imm8

 

 

 

 

Description

Loads src value to repeat counter. Execute next instruction src value + 2 times.

 

Interrupts are queued during RPT instruction. Queued interrupts are serviced

 

after execution completes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Syntax

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RPT {adrs}8

 

 

Load data memory byte to repeat counter, repeat next instruction

 

 

RPT imm8

 

 

Load immediate byte to repeat counter, repeat next instruction

 

 

See Also

BEGLOOP, ENDLOOP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Example 4.14.60.1

RPT *0x0100 * 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MOV *R1++, A0, ++A

Loads the repeat counter with value stored in word data memory location 0x0100. Only 8 bits of data from this location are used. The next instruction stores content of A0 to data memory address pointed by R1. Since R1 post increments and A0 preincrements in this instruction, the overall effect of executing this instruction with RPT is to store accumulator contents to consecutive data memory locations. See MOV instruction for detail of various syntax of MOV instruction.

Example 4.14.60.2

RPT

200

 

NOP

 

Repeat the NOP instruction 202 times (provided the next instruction is repeatable). This causes 203 instruction cycle delay (including 1 cycle for the RPT instruction).

Assembly Language Instructions

4-155

Page 247
Image 247
Texas Instruments MSP50C614 manual RPT Repeat Next Instruction, Load src to repeat counter, Load imm8 to repeat counter