LP5569 datasheet(33/93 Pages) TI2

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LP5569

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SNVSAP8A – JULY 2017 – REVISED SEPTEMBER 2017

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8.5.2.5.4

MAP_CLR

The map_clr instruction clears engine-to-driver mapping. After the mapping has been released from an LED, the

PWM register value still controls the LED brightness.

8.5.2.5.5

MAP_NEXT

This instruction sets the next row active in the mapping table each time it is called. For example, if the second

row is active at this moment, after the map_next instruction call the third row is active. If the mapping table end

address is reached, activation rolls to the mapping-table start address the next time when the map_next

instruction is called. The engine does not push a new PWM value to the LED driver output before the set_pwm

or ramp instruction is executed. If the mapping has been released from an LED, the value in the PWM register

still controls the LED brightness.

8.5.2.5.6

LOAD_NEXT

Similar to the map_next instruction with the exception that no mapping is set. The index pointer is set to point to

the next row and the engine-to-LED-driver connection is not updated.

8.5.2.5.7

MAP_PREV

This instruction sets the previous row active in the mapping table each time it is called. For example, if the third

row is active at this moment, after the map_prev instruction call the second row is active. If the mapping table

start address is reached, activation rolls to the mapping table end address next time the map_prev instruction is

called. The engine does not push a new PWM value to the LED driver output before the set_pwm or ramp

instruction is executed. If the mapping has been released from an LED, the value in the PWM register still

controls the LED brightness.

8.5.2.5.8

LOAD_PREV

Similar to the map_prev instruction with the exception that no mapping is set. The index pointer is set to point to

the previous row and the engine-to-LED-driver connection is not updated.

8.5.2.5.9

MAP_ADDR

The map_addr instruction sets the index pointer to point to the mapping table row defined by bits [6:0] and sets

the row active. The engine does not push a new PWM value to the LED driver output before the set_pwm or

ramp instruction is executed. If the mapping has been released from an LED, the value in the PWM register still

controls the LED brightness.

NAME

VALUE (d)

DESCRIPTION

SRAM address

0–127

SRAM address containing mapping data restricted to lower half of memory.

8.5.2.5.10

LOAD_ADDR

The load_addr instruction sets the index pointer to point to the mapping table row defined by bits [6:0], but the

row is not set active.

NAME

VALUE (d)

DESCRIPTION

SRAM address

0–127

SRAM address containing mapping data restricted to lower half of memory.

8.5.2.6 Branch Instructions

8.5.2.6.1

BRANCH

The branch instruction is provided for repeating a portion of the program code several times. The branch

instruction loads a step number value to the program counter. A loop count parameter defines how many times

the instructions inside the loop are repeated. The step number is loaded into the PC when the instruction is

executed. The PC is relative to the ENGINEx_PROG_START register setting. The LP5569 device supports

nested looping, that is, a loop inside a loop. The number of nested loops is not limited. The instruction takes 16

32-kHz clock cycles.

LP5569 数据表(PDF) 33 Page - Texas Instruments

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