CRX14 데이터 시트보기 (PDF) - STMicroelectronics

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CRX14

Low Cost ISO14443 type-B Contactless Coupler Chip with Anti-Collision, CRC Management and Anti-Clone Function

STMicroelectronics 

CRX14

If a CRC error is detected, the Status Slot Bit is set

to ‘0’, and the corresponding Slot_Register is set

to FFh.

Each time the Slot Marker Register is accessed in

I²C Write mode, Byte 0 of the Input/Output Frame

Register is set to 18, Bytes 1 and 2 provide Status

Bits Slot information, and Bytes 3 to 18 store the

corresponding Chip_ID or error code.

The Slot Marker Register cannot be accessed in

I²C Read mode. All the anti-collision data can be

accessed by reading the Input/Output Frame Reg-

ister at the I²C address 01h.

Table 5. Slot Marker Register Description

b7

b6

b5

b4

b3

b2

b1

Byte 0

Number of stored Bytes: fixed to 18

Byte 1

Status Slot Status Slot Status Slot Status Slot Status Slot Status Slot Status Slot

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Byte 2

Status Slot Status Slot Status Slot Status Slot Status Slot Status Slot Status Slot

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Byte 3

Slot_Register 0 = Chip_ID value detected in Slot 0

Byte 4

Slot_Register 1 = Chip_ID value detected in Slot 1

Byte 5

Slot_Register 2 = Chip_ID value detected in Slot 2

Byte 6

Slot_Register 3 = Chip_ID value detected in Slot 3

Byte n

.....

Byte 17

Slot_Register 14 = Chip_ID value detected in Slot 14

Byte 18

Slot_Register 15 = Chip_ID value detected in Slot 15

Status bit value description:

1: No error detected. The Chip_ID stored in the Slot register is valid.

0: Error detected

- Slot register = 00h: No answer frame detected from ST short range memory

- Slot register = FFh: Answer Frame detected with CRC error. Collision may have occurred

b0

Status Slot

Bit 0

Status Slot

Bit 8

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