FXOS8700CQ datasheet(29/86 Pages) FREESCALE

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9.1.4

TRIG_CFG (0x0A) register

FIFO trigger configuration register. After the interrupt flag of the enabled event in TRIG_CFG is set, the FIFO (when configured

in Trigger mode) is gated at the time of the interrupt event preventing the further collection of data samples. This allows the host

processor to analyze the data leading up to the event detection (up to 32 samples). For detailed information on how to utilize the

FIFO and the various trigger events, please see AN4073 available on the Freescale website.

9.1.5

SYSMOD (0x0B) register

The system mode register indicates the current device operating mode. Applications using the Auto-Sleep/Auto-Wake

mechanism should use this register to synchronize their application with the device operating mode. The system mode register

also indicates the status of the FIFO gate error flag and the time elapsed since the FIFO gate error flag was asserted.

Table 18. FIFO sample count bit description

Field

Description

f_cnt[5:0]

These bits indicate the number of acceleration samples currently stored in the FIFO buffer. Count 0b000000 indicates that

the FIFO is empty.

FIFO sample counter. Default value 0b000000.

(0b000001 to 0b100000 indicates 1 to 32 samples stored in FIFO

—

trig_trans

trig_lndprt

trig_pulse

tria_ffmt

trig_a_vecm

—

00000000

Figure 13. TRIG_CFG register

Table 19. TRIG_CFG bit descriptions

Field

Description

trig_trans

Transient interrupt FIFO trigger enable.

trig_lndprt

Landscape/Portrait orientation interrupt FIFO trigger enable.

trig_pulse

Pulse interrupt FIFO trigger enable

tria_ffmt

Freefall/motion interrupt FIFO trigger enable

trig_a_vecm

Acceleration vector magnitude FIFO trigger enable.

fgerr

fgt[4:0]

sysmod[1:0]

Figure 14. SYSMOD register

Table 20. SYSMOD bit description

Field

Description

fgerr

FIFO gate error. Default value: 0.

0: No FIFO gate error detected.

1: FIFO gate error was detected.

Emptying the FIFO buffer clears the fgerr bit in the SYSMOD register.

See CTRL_REG3 [Interrupt CTRL register] (0x2C) for more information on configuring the FIFO Gate function.

fgt[4:0]

Number of ODR time units since fgerr was asserted. Reset when fgerr is cleared

sysmod[1:0]

System mode. Default value: 0.

00: Standby mode

01: Wake mode

10: Sleep mode

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