NXP Semiconductors
SL3S4011_4021
UCODE I²C
SL3S4011_4021 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
Product data sheet Rev. 3.5 — 18 September 2018
COMPANY PUBLIC 204935 13 / 30
Feature Bit type via RF via I
2
C
bit address Access Address Access
UHF antenna port1 on/off permanent 208h r/w r/w
UHF antenna port2 on/off permanent 209h r/w r/w
rfu 20Ah
SCL INT enable permanent 20Bh r/w read only
bit for read protect user memory permanent 20Ch r/w r/w
bit for read protect EPC permanent 20Dh r/w r/w
bit for read protect TID SNR (48 bits) permanent 20Eh r/w r/w
PSF alarm flag permanent 20Fh r/w read only
[1] Indicator bits are reset at power-up but cannot be changed by command
[2] Defaults values for bit3/bit2/bit1 are 0/0/1 (see Table 15)
[3] Permanent bits are permanently stored bits in the memory
10.3 Change Config Command
The UCODE I
2
C ChangeConfig custom command allows handling the special features
described in the previous paragraph. As long the EPC bank is not write locked standard
EPC READ/WRITE commands can be used to modify the flags.
Table 11. ChangeConfig custom command
Command RFU Data RN CRC-16
No. of bits 16 8 16 16 16
Description 11100000
00000111
00000000 Toggle bits
XOR RN16
handle -
The bits to be toggled in the configuration register need to be set to '1'.
E.g., sending 0000 0000 0000 0000 1001 XOR RN16 will activate the EPC Read Protect
and PSF bit. Sending the very same command a second time will disable the features.
The reply of the ChangeConfig will return the current register setting.
Table 12. ChangeConfig custom response table
Starting state Condition Response Next state
ready all - ready
arbitrate, reply,
acknowledged
all - arbitrate
valid handle, Status word
needs to change
Backscatter unchanged
StatusWord immediately
openopen
valid handle, Status word
does not need to change
Backscatter StatusWord
immediately
open
valid handle, Status word
needs to change
Backscatter modified
StatusWord, when done
secured
valid handle, Status word
does not need to change
Backscatter StatusWord
immediately
secured
secured
invalid handle - secured
