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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST25R95 데이터시트(PDF) 38 Page - STMicroelectronics |
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ST25R95 데이터시트(HTML) 38 Page - STMicroelectronics |
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38 / 61 page  How to modify analog register configuration register (ACC_A) values • Use the ProtocolSelect command ( 0x02) to select the correct communication protocol. For example, to select the ISO/IEC 14443-A card emulation protocol: • Send ProtocolSelect command: • ST25R95 reply >>> 0x02021208 <<< 0x0000 • Read the analog register configuration register (ACC_A) value. • Write the ACC_A register index at 0x04: • ST25R95 reply: >>> >>>0x0903680004 <<< 0x0000 • Read the ACC_A register value: • ST25R95 reply: >>> 0x0803690100 <<< 0x000127 In this example, the ACC_A register value is 0x27, where “2” is the demodulator sensitivity and “7” is the load modulation index. • Modify the load modulation index values with 0x25. • Write the ARC_A register index: • ST25R95 reply: >>> 0x090468010425 <<< 0x0000 • Read the analog configuration register (ACC_A) value. • Write the ACC_A register index at 0x04: • ST25R95 reply: >>> 0x0903680004 <<< 0x0000 • Read the ARC_A register value: • ST25R95 reply: <<< >>> 0x0803690100 <<< 0x000125 Load modulation index and demodulator sensitivity values Table 33. Possible load modulation index values Code (bits [3:0] of ACC_A register) 1 2 ... 7 ... E F Load modulation index Min. - - Default - - Max. Table 34. Possible demodulator sensitivity values Code (bits [5:4] of ACC_A register) 0x1 0x2 Demodulator Sensitivity (1) 10% 100% 1. Characterized by design simulation. Note: Bits [7:6] of ACC_A register are RFU and must set to ‘0’. ST25R95 Write Register (WrReg) command (0x09) description DS12807 - Rev 4 page 38/61 |
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