HTMS1x01_8x01 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.4 — 21 May 2015
152934 42 of 57
NXP Semiconductors
HTMS1x01; HTMS8x01
HITAG µ transponder IC
14.11 WRITE ISO 11785 (custom command)
[, Advanced, Advanced+]
Upon reception of this command without error, the transponder IC (in Ready state) writes
128-bit of ISO 11785 TTF data into suitable reserved memory block and report the
success of the operation in the response. The user does not have to attend whether the
data is compliant to ISO 11785 or not. The command data block is sent exactly the same
way as it is sent by the transponder IC in TTF mode (Header, 64-bit ID, CRC…) after
entering the field again.
There are two different command codes one for locking the TTF area after successful
write command and one without locking.
The command must be completed by a reset of the IC. After entering the RF field the
ISO 11785 data is sent when the transponder is in ISO 11785 state.
Error Flag set to ’0’ indicates no error.
The minimum value of T
Fp1
is 20 ms.
Table 41. WRITE ISO 11785 - request format (38h, 39h)
Flags Command Data 1 CRC-16 Description
5 6 128 (16) No. of bits
00(1)00 111000 ISO 11785 TTF data
00(1)00 111001 ISO 11785 TTF data inc. LOCK
Table 42. Response to a successful WRITE ISO 11785 request
Error flag CRC-16 Description
1 (16) No. of bits
0
Fig 19. Waiting time before a response for WRITE ISO 11785 command
001aaj833
carrier on
request
response
request (or EOF)
carrier off
load off
load on
HITAG μ
transceiver
T
NRT
T
Fp1
T
Fp2
