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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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11AA020-E/P датащи(PDF) 16 Page - Microchip Technology |
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11AA020-E/P датащи(HTML) 16 Page - Microchip Technology |
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16 / 38 page  11AAXXX/11LCXXX DS22067E-page 16 Preliminary © 2008 Microchip Technology Inc. 4.7 Erase All (ERAL) Instruction The ERAL instruction allows the user to write ‘0x00’ to the entire memory array with one command. Note that the write enable latch (WEL) must first be set by issuing the WREN instruction. Once the write enable latch is set, the user may pro- ceed with issuing a ERAL instruction (including the header and device address bytes). Immediately after the NoMAK bit has been transmitted by the master, the internal write cycle is initiated, during which time all words of the memory array are written to ‘0x00’. The ERAL instruction is ignored if either of the Block Protect bits (BP0, BP1) are not 0, meaning 1/4, 1/2, or all of the array is protected. FIGURE 4-8: ERASE ALL COMMAND SEQUENCE 4.8 Set All (SETAL) Instruction The SETAL instruction allows the user to write ‘0xFF’ to the entire memory array with one command. Note that the write enable latch (WEL) must first be set by issuing the WREN instruction. Once the write enable latch is set, the user may pro- ceed with issuing a SETAL instruction (including the header and device address bytes). Immediately after the NoMAK bit has been transmitted by the master, the internal write cycle is initiated, during which time all words of the memory array are written to ‘0xFF’. The SETAL instruction is ignored if either of the Block Protect bits (BP0, BP1) are not 0, meaning 1/4, 1/2, or all of the array is protected. FIGURE 4-9: SET ALL COMMAND SEQUENCE Note: The ERAL instruction must be termi- nated with a NoMAK following the com- mand byte. If a NoMAK is not received at this point, the command will be consid- ered invalid, and the device will go into Idle mode without responding with a SAK or executing the command. 11 0 1 0 1 00 Start Header SCIO Device Address 00 0 0 1 0 10 Command 11 1 0 1 1 00 Standby Pulse SCIO Twc Note: The SETAL instruction must be termi- nated with a NoMAK following the com- mand byte. If a NoMAK is not received at this point, the command will be consid- ered invalid, and the device will go into Idle mode without responding with a SAK or executing the command. 11 0 1 0 1 00 Start Header SCIO Device Address 00 0 0 1 0 10 Command 11 0 0 1 1 01 Standby Pulse SCIO Twc |
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