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MCRF200IW00A Scheda tecnica(PDF) 6 Page - Microchip Technology |
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MCRF200IW00A Scheda tecnica(HTML) 6 Page - Microchip Technology |
6 / 24 page MCRF200 DS21219H-page 6 2003 Microchip Technology Inc. FIGURE 2-3: PSK DATA MODULATION 2.2.4 MEMORY ARRAY LOCK BIT (CB12) The CB12 must be ‘0’ for contactless programming (Blank). The bit (CB12) is automatically set to ‘1’ as soon as the device is programmed contactlessly. 2.3 Memory Section The device has 128 bits of one-time programmable (OTP) memory. The user can choose 96 or 128 bits by selecting the CB1 bit in the configuration register. See Table 2-4 for more details. 2.3.1 COLUMN AND ROW DECODER LOGIC AND BIT COUNTER The column and row decoders address the EEPROM array at the clock rate and generate a serial data stream for modulation. This data stream can be up to 128 bits in length. The size of the data stream is user programmable with CB1 and can be set to 96 or 128 bits. Data lengths of 48 and 64 bits are available by programming the data twice in the array, end-to-end. The column and row decoders route the proper voltage to the array for programming and reading. In the programming modes, each individual bit is addressed serially from bit 1 to bit 128. 2.4 Examples of Configuration Settings EXAMPLE 2-1: “08D” CONFIGURATION EXAMPLE 2-2: “00A” CONFIGURATION EXAMPLE 2-3: MCRF200 CONFIGURATION FOR FDX-B ISO ANIMAL STANDARD PROTOCOL (ASP) P P PP PP PP PP PP ‘0’ ‘0’ ‘1’ ‘1’ Encoded Data PSK_ 1 Change on Data PSK _2 Change on ‘1’ (NRZ_L) ‘1’ The “08D” (hex) configuration is interpreted as follows: “08D” → 0000-1000-1101 Referring to Table 2-4, the “08D” configuration represents: Modulation = PSK_1 PSK rate = rf/2 Data encoding = NRZ_L (direct) Baud rate = rf/32 = MOD32 Memory size 128 bits CB12 CB1 The “00A” (hex) configuration is interpreted as follows: “00A” → 0000-0000-1010 The MSB corresponds to CB12 and the LSB corresponds to CB1 of the configuration register. Therefore, we have: Referring to Table 2-4, the “00A” configuration represents: Not programmed device (blank), anticollision: disabled, FSK protocol, NRZ_L (direct) encod- ing, MOD50 (baud rate = rf/50), 96 bits. CB12=0 CB11=0 CB10=0 CB9=0 CB8=0 CB7=0 CB6=0 CB5=0 CB4=1 CB3=0 CB2=1 CB1=0 CB12 CB1 The FDX-B ISO Specification is: Modulation = ASK Data encoding = Differential biphase Baud rate = rf/32 = 4 Kbits/sec for 128 kHz Memory size = 128 bits Referring to Table 2-4, the equivalent MCRF200 configuration is: “14D”. |
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