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11LC020-E/MS Datasheet(PDF) 10 Page - Microchip Technology |
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11LC020-E/MS Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 38 page  11AAXXX/11LCXXX DS22067E-page 10 Preliminary © 2008 Microchip Technology Inc. 4.0 DEVICE COMMANDS After the device address byte, a command byte must be sent by the master to indicate the type of operation to be performed. The code for each instruction is listed in Table 4-1. TABLE 4-1: INSTRUCTION SET 4.1 Read Instruction The Read command allows the master to access any memory location in a random manner. After the READ instruction has been sent to the slave, the two bytes of the Word Address are transmitted, with an Acknowl- edge sequence being performed after each byte. Then, the slave sends the first data byte to the master. If more data is to be read, the master sends a MAK, indicating that the slave should output the next data byte. This continues until the master sends a NoMAK, which ends the operation. To provide sequential reads in this manner, the 11XX contains an internal Address Pointer which is incre- mented by one after the transmission of each byte. This Address Pointer allows the entire memory contents to be serially read during one operation. When the highest address is reached, the Address Pointer rolls over to address ‘0x000’ if the master chooses to continue the operation by providing a MAK. FIGURE 4-1: READ COMMAND SEQUENCE Instruction Name Instruction Code Hex Code Description READ 0000 0011 0x03 Read data from memory array beginning at specified address CRRD 0000 0110 0x06 Read data from current location in memory array WRITE 0110 1100 0x6C Write data to memory array beginning at specified address WREN 1001 0110 0x96 Set the write enable latch (enable write operations) WRDI 1001 0001 0x91 Reset the write enable latch (disable write operations) RDSR 0000 0101 0x05 Read STATUS register WRSR 0110 1110 0x6E Write STATUS register ERAL 0110 1101 0x6D Write ‘0x00’ to entire array SETAL 0110 0111 0x67 Write ‘0xFF’ to entire array 76 5 4 Data Byte 1 32 1 0 76 5 4 Data Byte 2 32 1 0 76 5 4 Data Byte n 32 1 0 SCIO 11 0 1 0 1 00 Start Header SCIO Device Address 00 0 0 1 0 10 Command 01 0 0 0 0 01 Standby Pulse SCIO 15 14 13 12 Word Address MSB 11 10 9 8 76 5 4 Word Address LSB 32 1 0 |
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