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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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H838532H датащи(PDF) 166 Page - Renesas Technology Corp |
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H838532H датащи(HTML) 166 Page - Renesas Technology Corp |
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166 / 508 page  Section 6 ROM Rev. 1.00 May 30, 2008 Page 146 of 484 REJ09B0436-0100 6.7.3 Memory Read Mode 1. After completion of auto-program/auto-erase/status read operations, a transition is made to the command wait state. When reading memory contents, a transition to memory read mode must first be made with a command write, after which the memory contents are read. Once memory read mode has been entered, consecutive reads can be performed. 2. In memory read mode, command writes can be performed in the same way as in the command wait state. 3. After powering on, memory read mode is entered. 4. Tables 6.10 to 6.12 show the AC characteristics. Table 6.10 AC Characteristics in Transition to Memory Read Mode Conditions: V CC = 3.3 V ±0.3 V, VSS = 0 V, Ta = 25°C ±5°C Item Symbol Min Max Unit Notes Command write cycle t nxtc 20 — µs Figure 6.7 CE hold time t ceh 0 — ns CE setup time t ces 0 — ns Data hold time t dh 50 — ns Data setup time t ds 50 — ns Write pulse width t wep 70 — ns WE rise time t r — 30 ns WE fall time t f — 30 ns CE OE CE A15 −A0 OE WE I/O7 −I/O0 Note: Data is latched on the rising edge of WE. tceh twep tf tr tces tnxtc Address stable tds tdh Command write Memory read mode Figure 6.7 Timing Waveforms for Memory Read after Memory Write |
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