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CAT25C02PA-TE13 Datasheet(PDF) 5 Page - Catalyst Semiconductor |
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CAT25C02PA-TE13 Datasheet(HTML) 5 Page - Catalyst Semiconductor |
5 / 10 page 5 CAT25C01/02/04/08/16 Doc. No. 25067-00 5/00 Advanced Information Status Register Bits Array Address Protection BP1 BP0 Protected 0 0 None No Protection 0 1 25C01: 60-7F Quarter Array Protection 25C02: C0-FF 25C04: 180-1FF 25C08: 0300-03FF 25C16: 0600-07FF 1 0 25C01: 40-7F Half Array Protection 25C02: 80-FF 25C04: 100-1FF 25C08: 0200-03FF 25C16: 0400-07FF 1 1 25C01: 00-7F Full Array Protection 25C02: 00-FF 25C04: 000-1FF 25C08: 0000-03FF 25C16: 0000-07FF BLOCK PROTECTION BITS 76543210 WPEN PR_MODE SPI_MODE X BP1 BP0 WEL RDY STATUS REGISTER HOLD HOLD HOLD HOLD HOLD: Hold HOLD is the HOLD pin. The HOLD pin is used to pause transmission to the CAT25C01/02/04/08/16 while in the middle of a serial sequence without having to re-transmit entire sequence at a later time. To pause, HOLD must be brought low while SCK is low. The SO pin is in a high impedance state during the time the part is paused, and transitions on the SI pins will be ignored. To resume communication, HOLD is brought high, while SCK is low. ( HOLD should be held high any time this function is not being used.) HOLD may be tied high directly to VCC or tied to VCC through a resistor. Figure 9 illustrates hold timing sequence. STATUS REGISTER The Status Register indicates the status of the device. The RDY (Ready) bit indicates whether the CAT25C01/ 02/04/08/16 is busy with a write operation. When set to 1 a write cycle is in progress and when set to 0 the device indicates it is ready. This bit is read onlyThe WEL (Write Enable) bit indicates the status of the write enable latch. When set to 1, the device is in a Write Enable state and when set to 0 the device is in a Write Disable state. The WEL bit can only be set by the WREN instruction and can be reset by the WRDI instruction. Protected Unprotected Status WPEN WP WP WP WP WP WEL Blocks Blocks Register 0 X 0 Protected Protected Protected 0 X 1 Protected Writable Writable 1 Low 0 Protected Protected Protected 1 Low 1 Protected Writable Protected X High 0 Protected Protected Protected X High 1 Protected Writable Writable WRITE PROTECT ENABLE OPERATION |
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