NXP Semiconductors
FXPS7115D4
Digital absolute pressure sensor, 40 kPa to 115 kPa
Table 15.ꢀRegister read response message bit field descriptions
Bit field
C[0], [3:1]
ST[1:0]
Definition
Register Read Command = '0110'
Status
RD[15:8]
RD[7:0]
The contents of the register addressed by RA[7:1] high byte (RA[0] = 1)
The contents of the register addressed by RA[7:1] low byte (RA[0] = 0)
8-bit CRC
CRC[7:0]
7.5.3.2 Register write command
The device supports a register write command. The register write command writes the
value specified in RD[7:0] to the register addressed by RA[7:0].
The response to a register write command is shown in Section 7.5.3.2.2 "Register write
response message format". The register write is executed and a response is transmitted
on the next SPI message if and only if all of the following conditions are met:
• No SPI error is detected (see Section 7.5.5.3 "SPI error")
• No MISO error is detected (see Section 7.5.5.4 "SPI data output verification error")
• The ENDINIT bit is cleared
– This applies to all registers with the exception of the RESET[1:0] bits in the
DEVLOCK_WR register
• No invalid register request is detected as described below
If these conditions are met, the register write is executed and the device responds to the
register write request as shown in Section 7.5.3.2.2 "Register write response message
format". Otherwise, no register is written and the device responds with the error response
as defined in Section 7.5.2 "SPI response format". The register is not written until the
transfer during which the register write was requested has been completed.
A register write command to a read-only register will not execute, but will result in a valid
response.
7.5.3.2.1 Register write command message format
Table 16.ꢀRegister write command message format
MSB: bit 31; LSB: bit 0
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
Register access command
Register address
16
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Command
C[3:0]
Fixed bits:
must = 0h
Register data
8-bit CRC
1
0
0
0
0
0
0
0
RA[7:1]
RA[0]
RD[7:0]
CRC[7:0]
Table 17.ꢀRegister write command message bit field descriptions
Bit field
Definition
C[3:0]
Register write command = '1000'
RA[7:0]
RD[7:0]
CRC[7:0]
RA[7:1] contains the byte address of the register to be written
RD[7:0] contains the data byte to be written to address RA[7:0]
8-bit CRC
FXPS7115D4
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© NXP B.V. 2019. All rights reserved.
Product data sheet
Rev. 3 — 5 December 2019
22 / 72
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