MFRC522_(2007) Просмотр технического описания (PDF) - NXP Semiconductors.
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MFRC522_ Datasheet PDF : 109 Pages
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NXP Semiconductors
MFRC522
Contactless Reader IC
9.1.1 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. In Table 6 the
access conditions are described.
Table 6: Behavior of Register Bits and its Designation
Abbreviation Behavior
Description
r/w
read and write These bits can be written and read by the μ-Controller. Since they
are used only for control means, there content is not influenced by
internal state machines, e.g. the ComIEnReg-Register may be
written and read by the μ-Controller. It will also be read by internal
state machines, but never changed by them.
dy
dynamic
These bits can be written and read by the μ-Controller.
Nevertheless, they may also be written automatically by internal
state machines, e.g. the Command-Register changes its value
automatically after the execution of the actual command.
r
read only
These register bits hold values which are determined by internal
states only, e.g. the CRCReady bit can not be written from
external but shows internal states.
w
write only
Reading these register bits returns always ZERO.
RFU
-
These registers are reserved for future use and shall not be
changed. In case of a write access, it is recommended to write
always the value “0”.
RFT
-
These register bits are reserved for future use or production test
and shall not be changed.
9.2 Register Description
9.2.1 Page 0: Command and Status
9.2.1.1 Reserved
Functionality is reserved for further use.
Table 7: Reserved register (address 00h); reset value: 00h
Bit
7
6
5
4
3
2
1
0
Symbol
-
Access
Rights
RFU
Table 8: Description of Reserved register bits
Bit
Symbol
Description
7 to 0 -
Reserved for future use.
9.2.1.2 CommandReg
Starts and stops command execution.
112132
Product data sheet
Rev. 3.2 — 22 May 2007
© NXP B.V. 2007. All rights reserved.
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