FS23 datasheet(63/230 Pages) NXP

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NXP Semiconductors

FS23

Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers

17.2 Timer functions

LDT_FNCT[2:0]

LDT Function

000

Function 1: In Normal mode, count and generate a flag or an interrupt when the counter

reaches the after-run value.

001

Function 2: In Normal mode, count until the counter reaches the after-run value and enters

Low-Power mode.

010

Function 3: In Normal mode, count until the counter reaches the after-run value and enters

Low-Power mode. Once in Low-Power mode, count until the counter reaches the wake-up

value and wakes up.

011

Function 4: In Low-Power mode, count until the counter reaches the wake-up value and

wakes up.

100

Function 5: In Low-Power mode, count and do not wake up unless the counter overflow

occurs or if the device wakes up by wake-up input source.

Table 30. LDT functions

aaa-051455

FUNCTIONS

Function 1

SPI: configure timer function 1

No entry in Low Power

mode controlled by LDT

Entry in Low Power mode

when after run value reached

Entry in Low Power mode

when after run value reached

Wake-up

value reached

Wake-up

value reached

Entry in Low

Power mode by SPI

Entry in Init mode

after wake up by timer

Entry in Init mode

after wake up by timer

Entry in init mode

after wake up by timer

SPI: write after run register

After run value reached

After run

value reached

After run

value reached

Timer counts

Entry in Low Power

mode by SPI

Timer counts

WAKE-UP (ex IOs)

WAKE-UP

INTB

SPI: write LDT_EN = 1

INTB when after run value reached

Function 2

SPI: configure timer function 2

SPI: write after run register

SPI: write LDT_EN = 1

Entry in Low Power mode after

run value reached

Entry in Low Power mode after

run value reached and wake up

when wake-up value reached

Function 3

SPI: configure timer function 3

SPI: write after run register

SPI: write wake-up register

SPI: write LDT_EN = 1

NORMAL MODE

LOW-POWER MODE (LPON/LPOFF)

Function 4

SPI: configure timer function 4

SPI: write wake-up register

SPI: go to Low Power mode

Wake up when wake-up

value reached

Function 5

SPI: configure timer function 5

SPI: write LDT_EN = 1

SPI: go to Low Power mode

Wake up when other wake-up

event occurs (ex lOs)

Figure 34. Long duration timer functions

FS23

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Product data sheet

Rev. 7.0 — 16 October 2024

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