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RC522 Datasheet(PDF) 41 Page - NXP Semiconductors

Part # RC522
Description  Contactless Reader IC
PDF  109 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

RC522 Datasheet(HTML) 41 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
41 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
9.2.4.4
TestPinEnReg
Enables the pin output driver on the test bus.
9.2.4.5
TestPinValueReg
Defines the values for the test port when it is used as I/O.
Table 109: TestPinEnReg register (address 33h); reset value: 80h
Bit
7
6
5
4
3
2
1
0
Symbol
RS232LineEn
TestPinEn
-
Access
Rights
r/w
r/w
RFU
Table 110: Description of TestPinEnReg bits
Bit
Symbol
Description
7
RS232LineEn
Set to logic 0, the lines MX and DTRQ for the serial UART are
disabled.
6 to 1
TestPinEn
Enables the pin output driver on D1 to D7.
Example:
Setting bit 1 to logic 1 enables D1
Setting bit 5 to logic 1 enables D5
Remark: If the SPI interface is used only D1 to D4 can be used. If the
serial UART interface is used and RS232LineEn is set to
logic 1 only D1 to D4 can be used.
0
-
Reserved for future use.
Table 111: TestPinValueReg register (address 34h); reset value: 00h
Bit
7
6
5
4
3
2
1
0
Symbol
UseIO
TestPinValue
-
Access
Rights
r/w
r/w
RFU
Table 112: Description of TestPinValueReg bits
Bit
Symbol
Description
7
UseIO
Set to logic 1, this bit enables the I/O functionality for the test port if
one of the serial interfaces is used. The input / ouput behaviour is
defined by TestPinEn in register TestPinEnReg. The value for the
output behaviour is defined in the bits TestPinVal.
6 to 0
TestPinValue
Defines the value of the test port, when it is used as I/O. Each output
has to be enabled by the TestPinEn bits in register TestPinEnReg.
Remark: Reading the register indicates the actual status of the pins
D6 - D1 if UseIO is set to logic 1. If UseIO is set to logic 0,
the value of the register TestPinValueReg is read back.
0
-
Reserved for future use.



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