LP55231 datasheet(42/59 Pages) TI2

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LP55231

SNOSCR5D – MARCH 2013 – REVISED DECEMBER 2016

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7.6.5.6 MUX_LD_NEXT

Similar than the mux_map_next instruction, but only the index pointer is set to point to the next row; that is, no

mapping is set, and the engine-to-LED-driver connection is not e updated.

7.6.5.7 MUX_MAP_PREV

This instruction sets the previous row active in the mapping table each time it is called. For example, if the 3rd

row is active at this moment, after mux_map_prev instruction call the 2nd row is active. If the mapping table start

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

called. Engine does not push a new PWM value to the LED driver output before 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.

7.6.5.8 MUX_LD_PREV

Similar than the mux_map_prev instruction, but only the index pointer is set to point to the previous row; that is,

no mapping is set, and the engine-to-LED-driver connection is not updated.

7.6.5.9 MUX_MAP_ADDR

Mux_map_addr sets the index pointer to point 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 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

0-95

Any SRAM address containing mapping data.

7.6.5.10 MUX_LD_ADDR

Mux_ld_addr sets the index pointer to point the mapping table row defined by bits [6:0], but the row is not set

active.

NAME

VALUE (d)

DESCRIPTION

SRAM address

0-95

Any SRAM address containing mapping data.

7.6.6 Branch Instructions

7.6.6.1 BRANCH

Branch instruction is mainly indented for repeating a portion of the program code several times. Branch

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

instructions inside the loop are repeated. The LP55231 supports nested looping, that is, loop inside loop. The

number of nested loops is not limited. Instruction takes sixteen 32-kHz clock cycles.

NAME

ACCEPTED VALUE (d)

DESCRIPTION

loop count (i)

0-63

The number of loops to be done. 0 means an infinite loop.

step number

0-95

The step number to be loaded to program counter.

loop count (ii)

0-3

Selects the variable for loop count value. Loop count is loaded with the value of the

variable defined below.

0 = local variable A

1 = local variable B

2 = global variable C

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

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