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PCA24S08ADP Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA24S08ADP Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 24 page PCA24S08A_1 © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 01 — 19 January 2010 8 of 24 NXP Semiconductors PCA24S08A 1024 × 8-bit CMOS EEPROM with access protection 6.4 Access protection Write operation on the Access protection registers can be performed when WP pin is LOW. If the WP pin is HIGH, all write operations are prohibited from the serial port, although write commands may be used to set the address for a subsequent read command. All access protection bits are stored on a separate page of the EEPROM that is not accessed using the normal commands of a PCA24S08A memory. See Section 6.4.2.2 “Access Protection Page (APP)” for more detail on this information. 6.4.1 RFID access fields (RF) Even though the PCA24S08A does not have the RFID capability, RFID access fields (RF) can be stored in order to keep existing software compatibility. The fields are stored in the EEPROM and organized as shown in Table 3. 6.4.2 Protection bits (PB) The protection bits fields in the Access Protection Page determine what type of accesses will be permitted via the serial port for each of the blocks on the chip. If an illegal access is attempted, the command will be NACKed. The MSB (if clear) prohibits all access to the block, and the LSB (if clear) prohibits writes. The fields are stored in the EEPROM and are organized as shown in Table 4. Fig 9. Master read PCA24S08A immediately after first byte (read mode); current address read 0101 X X 1 A S 1 START condition R/W acknowledge from slave DATA P STOP condition A no acknowledge from master DATA auto-increment word address last byte 002aae794 n bytes A auto-increment word address acknowledge from master Table 3. RFID access field organization MSB LSB Function 0 0 no accesses permitted from RFID port 0 1 no accesses permitted from RFID port 1 0 read only from RFID port 1 1 no restrictions for RFID accesses Table 4. PB organization MSB LSB Function 0 0 no accesses permitted in the block 0 1 no accesses permitted in the block 1 0 read only; writes cause a NACK 1 1 read/write; no access constraints for data within this block |
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