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參數(shù)資料
| 型號： | MFRC53101T |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | ISO-IEC 14443 reader IC |
| 封裝： | MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 51, 2004,;MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html< |
| 文件頁數(shù)： | 18/116頁 |
| 文件大小： | 862K |
| 代理商： | MFRC53101T |
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MFRC531_34
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.4 — 26 January 2010
056634
18 of 116
NXP Semiconductors
MFRC531
ISO/IEC 14443 reader IC
9.3.2
Controlling the FIFO buffer
In addition to writing to and reading from the FIFO buffer, the FIFO buffer pointers can be
reset using the FlushFIFO bit. This changes the FIFOLength[6:0] value to zero, bit
FIFOOvfl is cleared and the stored bytes are no longer accessible. This enables the FIFO
buffer to be written with another 64 bytes of data.
9.3.3
FIFO buffer status information
The microprocessor can get the following FIFO buffer status data:
the number of bytes stored in the FIFO buffer: bits FIFOLength[6:0]
the FIFO buffer full warning: bit HiAlert
the FIFO buffer empty warning: bit LoAlert
the FIFO buffer overflow warning: bit FIFOOvfl.
Remark:
Setting the FlushFIFO bit clears the FIFOOvfl bit.
The MFRC531 can generate an interrupt signal when:
bit LoAlertIRq is set to logic 1 and bit LoAlert = logic 1, pin IRQ is activated.
bit HiAlertIRq is set to logic 1 and bit HiAlert = logic 1, pin IRQ activated.
The HiAlert flag bit is set to logic 1 only when the WaterLevel[5:0] bits or less can be
stored in the FIFO buffer. The trigger is generated by
Equation 1
:
(1)
The LoAlert flag bit is set to logic 1 when the FIFOLevel register’s WaterLevel[5:0] bits or
less are stored in the FIFO buffer. The trigger is generated by
Equation 2
:
(2)
ReadE2
yes
yes
the microprocessor has to prepare the arguments,
afterwards only reading is allowed
LoadKeyE2
LoadKey
Authent1
Authent2
LoadConfig
CalcCRC
yes
yes
yes
-
yes
yes
-
-
-
-
-
-
Table 17.
Active
command
FIFO buffer access
…continued
FIFO buffer
μ
p Write
Remark
μ
p Read
HiAlert
64
FIFOLength
–
(
)
WaterLevel
≤
=
LoAlert
FIFOLength
WaterLevel
≤
=
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