mfrc500 NXP Semiconductors, mfrc500 Datasheet - Page 93

• Manufacturer Part Number: mfrc500
• Description: Highly Integrated Iso14443a Reader Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Highly Integrated ISO 14443A Reader IC
15.3 Registers Relevant for the Serial Signal Switch
The flags DecoderSource define the input signal for the internal Manchester decoder in the following way:
ModulatorSource defines the signal that modulates the transmitted 13.56 MHz energy carrier. The modulated
signal drives the pins TX1 and TX2.
MFOUTSelect selects the output signal which is routed to the pin MFOUT.
Note: To use MFOUTSelect, the value of test signal control bit SignalToMFOUT has to be 0.
ModulatorSource
DecoderSource
MFOUTSelect
0
1
2
3
0
1
2
3
0
1
2
3
4
5
6
7
Constant 0
Output of the analog part. This is the default configuration.
Direct connection to MFIN, expecting a 847.5 kHz sub-carrier signal modulated by
a Manchester coded signal.
Direct connection to MFIN, expecting a Manchester coded signal.
Constant 0 (energy carrier off at pin TX1 and TX2).
Constant 1 (continuous energy carrier delivered at pin TX1 and TX2).
Modulation signal (envelope) from the internal coder. This is the default
configuration.
Direct connection to MFIN, expecting a Miller pulse coded signal.
Table 15-2: Values for ModulatorSource
Constant Low
Constant High
Modulation signal (envelope) from the internal coder.
Serial data stream that is to be transmitted
(same as for MFOUTSelect = 2, but not coded by the Miller pulse coder yet).
Output signal of the receiver circuit (card modulation signal regenerated
and delayed)
Output signal of the subcarrier demodulator (Manchester-coded card signal)
RFU
RFU
Table 15-1: Values for DecoderSource
Table 15-3: Values for MFOUTSelect
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Signal Routed to Pin MFOUT
Input Signal for Modulator
Input Signal for Decoder
Product Specification Rev. 3.2;December 2005
MF RC500
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