Datasheet

Preliminary Data Sheet
BMA400
Page 122 /
Confidential
BST-BMA400-DS000-00 | Version 0.1 | November 2017 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
Register (0x7E) CMD
DESCRIPTION: Command Register
RESET: 0x00
DEFINITION (Go to register map):
Name
Register (0x7E) CMD
Bit
7
6
5
4
Read/Write
RW
RW
RW
RW
Reset Value
0
0
0
0
Content
cmd
Bit
3
2
1
0
Read/Write
RW
RW
RW
RW
Reset Value
0
0
0
0
Content
cmd
cmd: Available commands (Note: Register will always read as 0x00):
cmd
0x00
nop
reserved. No command.
0xb0
fifo_flush
Clears all data in the FIFO, does not change FIFO_CONFIG and
FIFO_DOWNS registers
0xb1
step_cnt_clear
Clears the value of the step counter to 0
0xb6
softreset
Triggers a reset, all user configuration settings are overwritten with their
default state
The device supports a command set to trigger certain activities and state transitions of the device.
The command interpreter is connected to register cmd. A command is invoked if the
corresponding Opcode is written to the cmd register.
Writing an undefined command to register cmd has no effect and cmd_err=’0’ in this case.
The device implements a simple handshaking mechanism to signal its readiness for accepting a
new command. Prior to writing a new command to the cmd register the user must read the status
bit cmd_rdy:
cmd_rdy = ’1’: device is ready to accept a command
cmd_rdy = ’0’: a command is being executed, any new command is ignored
cmd_err is set to ‘1’ when command execution failed. cmd_err is reset to ‘0’ if the last command
execution was successful. This is a clear-on-read bit.
After the softreset command has been invoked, status and error register are updated after Tst_up.
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