MMA8652FC datasheet(32/77 Pages) FREESCALE

32 / 77 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.6

System status and ID registers

6.6.1

0x0B: SYSMOD System Mode register

The System mode register indicates the current device operating mode. Applications using the Auto-SLEEP/WAKE mechanism

should use the SYSMOD register to synchronize the application with the device operating mode transitions. The SYSMOD register

also indicates the status of the FIFO gate error and the number of samples since the gate error occurred.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

FGERR

FGT_4

FGT_3

FGT_2

FGT_1

FGT_0

SYSMOD1

SYSMOD0

Figure 25. 0x0B SYSMOD: System Mode register (Read-Only)

Table 19. SYSMOD register

Bit(s)

Field

Description

7FGERR

FIFO Gate Error

0 No FIFO Gate Error detected. (default)

1 FIFO Gate Error was detected.

Emptying the FIFO buffer clears the FGERR bit in the SYS_MOD register.

For more information about configuring the FIFO Gate function, see Section 6.13.3, “0x2C: CTRL_REG3

Interrupt Control register”.

6–2

FGT[4:0]

Number of ODR time units since FGERR was asserted.

Reset when FGERR bit is cleared.

0_0000 (default)

1–0

SYSMOD[1:0]

System Mode

00 STANDBY mode (default)

01 WAKE mode

10 SLEEP mode

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