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AT25010A Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT25010A Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 18 page 5 5087E–SEEPR–7/09 AT25010A/020A/040A/080A CHIP SELECT: The AT25010A/020A/040A is selected when the CS pin is low. When the device is not selected, data will not be accepted via the SI pin, and the serial output pin (SO) will remain in a high impedance state. HOLD: Th e HOL D p i n is u s ed in c onju n ctio n with th e CS pin to se lect th e AT25010A/020A/040A. When the device is selected and a serial sequence is underway, HOLD can be used to pause the serial communication with the master device without resetting the serial sequence. To pause, the HOLD pin must be brought low while the SCK pin is low. To resume serial communication, the HOLD pin is brought high while the SCK pin is low (SCK may still toggle during HOLD). Inputs to the SI pin will be ignored while the SO pin is in the high impedance state. WRITE PROTECT: The write protect pin (WP) will allow normal read/write operations when held high. When the WP pin is brought low, all write operations are inhibited. WP going low while CS is still low will interrupt a write to the AT25010A/020A/040A. If the internal write cycle has already been initiated, WP going low will have no effect on any write operation. Figure 4-1. SPI Serial Interface AT25010A/020A/040A |
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