FXLS8964AF datasheet(48/98 Pages) NXP

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NXP Semiconductors

FXLS8964AF

3-Axis Low-g Accelerometer

FXLS8964AF

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Objective data sheet

Rev. 2 — 30 October 2020

48 / 98

13.10 SYS_MODE register (address 14h)

The

SYS_MODE register indicates the current device operating mode. Applications

using the Auto-WAKE/SLEEP mechanism should use this register to synchronize their

application with FXLS8964AF operating mode transitions. This register also indicates the

status of the buffer gate error flag and the buffer gate count.

Table 44. SYS_MODE register (address 14h) bit allocation

Bit

Name

BUF_

GATE_

ERR

BUF_GATE_CNT[4:0]

SYS_MODE[1:0]

Reset (BT_MODE = GND)

—

Reset (BT_MODE = VDD)

—

Access

Table 45. SYS_MODE register (address 14h) bit description

Field

Description

BUF_GATE_ERR

Buffer gate error flag:

0: A buffer gate error has not been detected

1: A buffer gate error was detected.

BUF CONFIG1[BUF _GATE] = 1 and the output buffer is not emptied before the arrival of the

next XYZ acceleration sample, the BUF _GATE_ERR flag will be asserted. The BUF GATE_ERR

flag will remain asserted as long as the output buffer remains un-emptied.

The BUF GATE_ERR flag may be cleared in one of the following ways:

1. Reading out the entire contents of the output buffer such that

BUF _STATUS[BUF_CNT[5:0]

] = 0.

2. Flushing (clearing) the output buffer contents by setting

BUF_CONFIG2[BUF _FLUSH] = 1.

3. Disabling the output buffer by setting

BUF _CONFIG1[BUF MODE[1:0]] = 00b, which clears

BUF_CNT.

4. Transitioning FXLS8964AF from Standby to Active mode.

BUF_GATE_CNT[4:0] The BUF_GATE_CNT field contains the number of OOR periods that have elapsed since the

BUF _GATE_ERR flag was asserted.

This buf_gate_cnt field is reset to 0 after any of the following actions:

1. The host reads out the entire contents of the output buffer such that

BUF

STATUS[BUF_CNT[5:0]] = 0.

2. The host flushes (clears) the output buffer by setting

BUF _CONFIG2[BUF _FLUSH] = 1.

3. Disable the output buffer by setting

BUF CONFIG1[BUF _MODE[1:0]] = 00b, which also

clears the buffer contents.

4. Transitioning FXLS8964AF from Standby to Active mode. which also clears the buffer

contents.

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