mfrc522 NXP Semiconductors, mfrc522 Datasheet - Page 41

• Manufacturer Part Number: mfrc522
• Description: Contactless Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
112132
Product data sheet
9.2.4.4 TestPinEnReg
9.2.4.5 TestPinValueReg
Enables the pin output driver on the test bus.
Table 109: TestPinEnReg register (address 33h); reset value: 80h
Table 110: Description of TestPinEnReg bits
Defines the values for the test port when it is used as I/O.
Table 111: TestPinValueReg register (address 34h); reset value: 00h
Table 112: Description of TestPinValueReg bits
Bit
7
6 to 1
0
Bit
7
6 to 0
0
Symbol RS232LineEn
Access
Symbol
Access
Rights
Rights
Bit
Bit
Symbol
RS232LineEn
TestPinEn
-
Symbol
UseIO
TestPinValue
-
UseIO
r/w
7
r/w
7
Rev. 3.2 — 22 May 2007
6
Description
Set to logic 0, the lines MX and DTRQ for the serial UART are
disabled.
Enables the pin output driver on D1 to D7.
Example:
Remark: If the SPI interface is used only D1 to D4 can be used. If the
Reserved for future use.
Description
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.
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
Reserved for future use.
Setting bit 1 to logic 1 enables D1
Setting bit 5 to logic 1 enables D5
6
5
serial UART interface is used and RS232LineEn is set to
logic 1 only D1 to D4 can be used.
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.
5
TestPinValue
4
4
TestPinEn
r/w
r/w
3
3
2
2
Contactless Reader IC
MFRC522
© NXP B.V. 2007. All rights reserved.
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RFU
RFU
0
0
-
-