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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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25CSM04T-I/MF датащи(PDF) 37 Page - Microchip Technology |
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25CSM04T-I/MF датащи(HTML) 37 Page - Microchip Technology |
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37 / 55 page  2019-2022 Microchip Technology Inc. and its subsidiares DS20005817D-page 37 25CSM04 10.1.4 ADDRESS LOCATION OF THE MEMORY PARTITION REGISTERS When attempting to access any of the device’s eight MPRs, the address of each MPR is embedded in bit position A18:A16 of the 24-bit address sent to the device. The remaining 21 address bits (A23-A19 and A15-A0) are ignored. Table 10-3 depicts the values needed to be sent in the A18 through A16 positions. 10.2 Writing to the Memory Partition Registers 10.2.1 MEMORY PARTITION REGISTER WRITE ENABLE (PRWE) Prior to any write sequence to protect an address boundary, or FRZR instruction, the WEL and PREL bits in the STATUS register must be set to ‘1’. This is accomplished by first sending a WREN (06h) instruction, (see Section 6.1.3 “Write Enable Latch”) followed by a PRWE (07h) instruction, as shown in Figure 10-3. Once both bits are set to ‘1’, the MPRs can be programmed with the WMPR instruction, the Partition Endpoint Addresses can be set with the PPAB instruction, or the contents of all MPRs can be permanently locked with the FRZR instruction. Upon completion of any of these instructions, the PREL and WEL bits are automatically reset to logic ‘0’. FIGURE 10-3: PARTITION REGISTER WRITE ENABLE (PRWE) INSTRUCTION TABLE 10-3: MEMORY PARTITION REGISTER ADDRESS LOCATION Memory Partition Register Number A18 A17 A16 MPR0 00 0 MPR1 00 1 MPR2 01 0 MPR3 01 1 MPR4 10 0 MPR5 10 1 MPR6 11 0 MPR7 11 1 SCK 0 234 567 1 High-Impedance SO CS SI PRWE Opcode (07h) 0 000 0 1 1 1 MSb |
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