mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 59

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
10.5.3.5 CoderControl register
10.5.3.6 ModWidth register
10.5.3.7 PreSet16 register
Sets the clock rate and the coding mode.
Table 75.
Table 76.
Selects the pulse modulation width.
Table 77.
Table 78.
Table 79.
Remark: These values must not be changed.
Bit
Symbol
Access
Bit
7 to 6 00
5 to 3 CoderRate[2:0]
2 to 0 TxCoding[2:0]
Bit
Symbol
Access
Bit
7 to 0
Bit
Symbol
Access
Symbol
Symbol
ModWidth[7:0]
CoderControl register (address: 14h) reset value: 0001 1001b, 19h bit allocation
CoderControl register bit descriptions
ModWidth register (address: 15h) reset value: 0001 0011b, 13h bit allocation
ModWidth register bit descriptions
PreSet16 register (address: 16h) reset value: 0000 0000b, 00h bit allocation
7
7
Rev. 3.4 — 26 January 2010
R/W
Value
-
000
001
010
011
100
111
000
001
010
011
7
00
6
Description
defines the width of the modulation pulse based on
t
mod
056634
Description
these values must not be changed
this register defines the clock rate for the encoder circuit
this register defines the bit encoding mode and framing during
transmission
6
= 2⋅(ModWidth + 1) / f
6
MIFARE 848 kBd
MIFARE 424 kBd
MIFARE 212 kBd
MIFARE 106 kBd; ISO/IEC 14443 A
ISO/IEC 14443 B
reserved
NRZ according to ISO/IEC 14443 B
MIFARE, ISO/IEC 14443 A, (Miller coded)
reserved
reserved
5
5
5
CoderRate[2:0]
4
ModWidth[7:0]
PreSet16[7:0]
4
R/W
R/W
clk
R/W
4
3
3
3
ISO/IEC 14443 reader IC
2
2
2
MFRC531
TxCoding[2:0]
© NXP B.V. 2010. All rights reserved.
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0
0
0