Sensors

Freescale Semiconductor, Inc.

31

MMA16xxKW

Figure 22. Initialization Sequence

Table 15. Initialization Response Bit Definitions

Bit Field

Definition

PA[3:0]

DSI device address. This field contains the device address. If the device is unprogrammed when the initialization command is issued, the

device address is assigned. This field contains the programmed address. An Initialization command which attempts to assign a device

address of zero is ignored.

Bnk[1:0]

These bits select the bank address for the user writable data registers. Bank selection affects the Read/Write NVM command operation.

Invalid combinations of B1 and B0 result in no response from the device to the associated initialization. Refer to Section 4.2.1.10 for fur-

ther details regarding register programming and bank selection.

BS

Bus Switch state. This bit controls the state of the bus switch:

1 - Close the bus switch

0 - Do not close the bus switch

NV

NVM Program Enable. This bit indicates if programming of the user-accessible OTP is enabled.

1 - OTP programming Enabled

0 - OTP programming Disabled

BF

This bit indicates the success or failure of the bus test performed as part of the Initialization command.

1 - Bus fault detected

0 - Bus test passed

INITIALIZATION

COMMAND?

BS == 1?

WAIT FOR NEXT DSI

BUS COMMAND

Y

N

Y

N

Y

N

SET BF FLAG

CLOSE BUS SWITCH

DELAY