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11LC020-E/MS 데이터시트(PDF) 11 Page - Microchip Technology |
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11LC020-E/MS 데이터시트(HTML) 11 Page - Microchip Technology |
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11 / 38 page ![]() © 2008 Microchip Technology Inc. Preliminary DS22067E-page 11 11AAXXX/11LCXXX 4.2 Current Address Read (CRRD) Instruction The internal address counter featured on the 11XX maintains the address of the last memory array loca- tion accessed. The CRRD instruction allows the mas- ter to read data back beginning from this current location. Consequently, no word address is provided upon issuing this command. Note that, except for the initial word address, the READ and CRRD instructions are identical, including the ability to continue requesting data through the use of MAKs in order to sequentially read from the array. As with the READ instruction, the CRRD instruction is terminated by transmitting a NoMAK. Table 4-2 lists the events upon which the internal address counter is modified. TABLE 4-2: INTERNAL ADDRESS COUNTER FIGURE 4-2: CRRD COMMAND SEQUENCE Command Event Action — Power-on Reset Counter is undefined READ or WRITE MAK edge fol- lowing each Address byte Counter is updated with newly received value READ , WRITE , or CRRD MAK/NoMAK edge following each data byte Counter is incre- mented by 1 Note: If, following each data byte in a READ, WRITE , or CRRD instruction, neither a MAK nor a NoMAK edge is received (i.e., if a standby pulse occurs instead), the internal address counter will not be incremented. Note: During a Write command, once the last data byte for a page has been loaded, the internal Address Pointer will rollover to the beginning of the selected page. 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 10 0 0 0 0 01 Standby Pulse SCIO |
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