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Product data sheet
COMPANY PUBLIC
Rev. 3.4 — 21 May 2015
152934 32 of 57
NXP Semiconductors
HTMS1x01; HTMS8x01
HITAG µ transponder IC
14.1 Flags
Every request command contains five flags which are sent in order Bit 1 (LSB) to Bit 5
(MSB). The specific meaning depends on the context.
Note:
For HITAG µ inventory (INV) flag and select (SEL) flag must be set to ’0’
Table 17. Command Flags
Bit Flag Full name Value Description
1 PEXT Protocol EXTension 0
1
No protocol format extension
RFU
2 INV INVentory 0
1
Flag 4 and Flag 5 are ’SEL’ and ’ADR’ Flag
Flag 4 and Flag 5 are ’RFU’ and ’NOS’ Flag
3 CRCT CRC-Transponder 0
1
Transponder IC respond without CRC
Transponder IC respond contains CRC
4SEL
(INV==0)
SELect in combination with ADR (see Table 19
)
5ADR
(INV==0)
ADdRess in combination with SEL (see Ta ble 19
)
4RFU
(INV==1)
Reserved for future
use
0 this flag is not used and set to '0'
5NOS
(INV==1)
0
1
16 slots while performing anti-collision
1 slot while performing anti-collision
Table 18. Command Flags - Bit order
MSB
bit5
bit4 bit3 bit2
LSB
bit1
INV==0 ADR SEL CRCT INV PEXT
INV==1 NOS RFU CRCT INV PEXT
Table 19. Meaning of ADR and SEL flag
ADR SEL Meaning
0 0 Request without UID, all
transponder ICs in READY state shall respond
1 0 Request contains UID, one
transponder IC (with corresponding UID) shall
respond
0 1 Request without UID, the
transponder IC in SELECTED state shall respond
1 1 Reserved for future use