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MCP98243 bảng dữ liệu(PDF) 42 Page - Microchip Technology |
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MCP98243 bảng dữ liệu(HTML) 42 Page - Microchip Technology |
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42 / 62 page  MCP9843/98243 DS22153C-page 42 © 2009 Microchip Technology Inc. 5.3.4.3 Sequential Read Sequential reads are initiated in the same way as a random read, with the exception that after the MCP98243 transmits the first data byte, the master issues an acknowledge, as opposed to a stop condition in a random read. This directs the MCP98243 to transmit the next sequentially addressed 8-bit word (Figure 5-20). To provide sequential reads, the MCP98243 contains an internal address pointer, which is incremented by one at the completion of each operation. This address pointer allows the entire memory contents to be serially read during one operation. FIGURE 5-20: Timing Diagram for Sequential Read (See Section 4.0 “Serial Communication”). 5.3.5 STANDBY MODE The design will incorporate a low power standby mode (ISHDN). Standby mode will be entered after a normal termination of any operation and after all internal functions are complete. This would include any error conditions occurring, such as improper number of clock cycles or improper instruction byte as defined previously. SDA A C K 10 1 0 A XX X X A C K S 2 A 1 A 0 12 3 4 5 6 7 8 1 2 3 4 5 678 SCL X Address Byte R MCP98243 MCP98243 Data at (n+1) A C K 1 2 3 4 5 678 12 3 4 567 8 Data at (n+2) Data (n)1 MCP98243 MCP98243 XX X XX X X X XX X X X X X X XX X Data at (n+m)(1) XX X XX X A C K Note 1: ‘n’ is the initial address location and ‘m’ is the final address location (‘n+m’ < 256) N A K P Master |
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