MFRC52201HN1 NXP Semiconductors, MFRC52201HN1 Datasheet - Page 33

• Manufacturer Part Number: MFRC52201HN1
• Description: RFID Modules & Development Tools CL READER IC'S
• Manufacturer: NXP Semiconductors

Specifications of MFRC52201HN1

• Data Rate: 3.4 Mbps
• Operating Temperature Range: + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MFRC52201HN1,157

NXP Semiconductors
9. MFRC522 registers
MFRC522_33
Product data sheet
PUBLIC
9.1 Register bit behavior
Depending on the functionality of a register, the access conditions to the register can vary.
In principle, bits with same behavior are grouped in common registers. The access
conditions are described in
Table 19.
Abbreviation Behavior
R/W
D
R
W
reserved
RFT
Behavior of register bits and their designation
read and write These bits can be written and read by the microcontroller. Since
dynamic
read only
write only
-
-
Rev. 3 — 26 October 2009
Table
Description
they are used only for control purposes, their content is not
influenced by internal state machines, for example the
ComIEnReg register can be written and read by the
microcontroller. It will also be read by internal state machines but
never changed by them.
These bits can be written and read by the microcontroller.
Nevertheless, they can also be written automatically by internal
state machines, for example the CommandReg register changes
its value automatically after the execution of the command.
These register bits hold values which are determined by internal
states only, for example the CRCReady bit cannot be written
externally but shows internal states.
Reading these register bits always returns zero.
These registers are reserved for future use and must not be
changed. In case of a write access, it is recommended to always
write the value “0”.
These register bits are reserved for future use or are for
production tests and must not be changed.
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19.
Contactless reader IC
MFRC522
© NXP B.V. 2009. All rights reserved.
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