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34VL02 数据表(PDF) 13 Page - Microchip Technology |
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34VL02 数据表(HTML) 13 Page - Microchip Technology |
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13 / 32 page ![]() © 2008 Microchip Technology Inc. DS22079A-page 13 34VL02 TABLE 7-2: ACKNOWLEDGE TABLE FOR WRITE OR WRITE PROTECTION WITH R/W = 0 TABLE 7-3: ACKNOWLEDGE TABLE FOR WRITE OR WRITE PROTECTION WITH R/W = 1 TABLE 7-1: SOFTWARE WRITE PROTECTION INSTRUCTION SET WP = 0 Address Pins Device Type Identifier Chip Select Bits R/W A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0 SWP VSS VSS VHV 0 110 0 0 1 0 CSWP VSS VCC VHV 0 110 0 1 1 0 PSWP A2 A1 A0 0 110 A2 A1 A0 0 Read SWP VSS VSS VHV 0 110 0 0 1 1 Read CSWP VSS VCC VHV 0 110 0 1 1 1 Read PSWP A2 A1 A0 0 110 A2 A1 A0 1 1. A0 is used to detect VHV for the SWP and CSWP commands. 2. B3, B2 and B1 are compared to the A2, A1 and A0 external pins, respectively on the 34XX02. Status Write- Protect Instruction ACK Address ACK Data Byte ACK Write Cycle Permanently Protected x PSWP, SWP, CSWP No Ack Don’t Care No Ack Don’t Care No Ack No PAGE or BYTE WRITE in lower 128 bytes Ack Address Ack Data No Ack No Protected with SWP 0 SWP No Ack Don’t Care No Ack Don’t Care No Ack No CSWP Ack Don’t Care Ack Don’t Care Ack Yes PSWP Ack Don’t Care Ack Don’t Care Ack Yes PAGE or BYTE WRITE in lower 128 bytes Ack Address Ack Data No Ack No 1 SWP No Ack Don’t Care No Ack Don’t Care No Ack No CSWP Ack Don’t Care Ack Don’t Care No Ack No PSWP Ack Don’t Care Ack Don’t Care No Ack No PAGE or BYTE WRITE Ack Address Ack Data No Ack No Not Protected 0 PSWP, SWP, or CSWP Ack Don’t Care Ack Don’t Care Ack Yes PAGE or BYTE WRITE Ack Address Ack Data Ack Yes 1 PSWP, SWP, or CSWP Ack Don’t Care Ack Don’t Care No Ack No PAGE or BYTE WRITE Ack Address Ack Address No Ack No Status Instruction ACK Permanently Protected PSWP, SWP, CSWP No Ack Protected with SWP SWP No Ack CSWP Ack PSWP Ack Not protected PSWP, SWP, CSWP Ack |
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