LP55231 datasheet(44/53 Pages) TI

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LP55231

SNOSCR5 – MARCH 2013

www.ti.com

External trigger input signal must stay low for at least two 32 kHz clock cycles to be executed. Trigger output

signal is three 32 kHz clock cycles long. External trigger signal is active low, i.e., when trigger is sent/received

the pin is pulled to GND. Send external trigger is masked; i.e., the device which has sent the trigger will not

recognize it. If send and wait external trigger are used on the same instruction, the send external trigger is

executed first, then the wait external trigger.

Name

Value (d)

Description

Wait for trigger from the engine(s). Several triggers can be defined in the same instruction. Bit

wait for trigger

0 - 31

[7] engages engine 1, bit [8] engine 2, bit [9] engine 3 and bit [12] is for external trigger I/O.

Bits [10] and [11] are not in use.

Send a trigger to the engine(s). Several triggers can be defined in the same instruction. Bit [1]

send a trigger

0 - 31

engages engine 1, bit [2] engine 2, bit [3] engine 3 and bit [6] is for external trigger I/O. Bits [4]

and [5] are not in use.

The LP55231 instruction set includes the following conditional jump instructions: jne (jump if not equal); jge (jump

if greater or equal); jl (jump if less); je (jump if equal). If the condition is true, a certain number of instructions will

be skipped (i.e., the program jumps forward to a location relative to the present location). If condition is false, the

next instruction will be executed.

Name

Value (d)

Description

number of instructions to be

The number of instructions to be skipped when the statement is true. Note: value 0

skipped if the operation returns

0 - 31

means redundant code.

true.

Defines the variable to be used in the test:

0 = local variable A

variable 1

0 - 3

1 = local variable B

2 = global variable C

3 = register address 3CH variable, or register address 42H value.

Defines the variable to be used in the test:

0 = local variable A

variable 2

0 - 3

1 = local variable B

2 = global variable C

3 = register address 3CH variable, or register address 42H value.

Arithmetic Instructions

This instruction is used to assign a value into a variable; the previous value in that variable is overwritten. Each

of the engines have two local variables, called A and B. The variable C is a global variable.

Name

Value (d)

Description

0 = variable A

target variable

0 - 2

1 = variable B

2 = variable C

8-bit value

0 - 255

Variable value

ADD

Operator either adds 8-bit value to the current value of the target variable, or adds the value of the variable 1 (A,

B, C or D) to the value of the variable 2 (A, B, C or D) and stores the result in the register of variable A, B or C.

Variables overflow from 255 to 0.

Name

Value (d)

Description

8-bit value (i)

0 - 255

The value to be added.

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