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CAT25C65Y14I-TE13 Datasheet(PDF) 5 Page - Catalyst Semiconductor |
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CAT25C65Y14I-TE13 Datasheet(HTML) 5 Page - Catalyst Semiconductor |
5 / 11 page 5 CAT25C33/65 Doc No. 1000, Rev. F SCK: Serial Clock SCK is the serial clock pin. This pin is used to synchro- nize the communication between the microcontroller and the 25C33/65. Opcodes, byte addresses, or data present on the SI pin are latched on the rising edge of the SCK. Data on the SO pin is updated on the falling edge of the SCK. CS CS CS CS CS: Chip Select CS is the Chip select pin. CS low enables the CAT25C33/ 65 and CS high disables the CAT25C33/65. CS high takes the SO output pin to high impedance and forces the devices into a Standby Mode (unless an internal write operation is underway). The CAT25C33/65 draws ZERO current in the Standby mode. A high to low transition on CS is required prior to any sequence being initiated. A low to high transition on CS after a valid write sequence is what initiates an internal write cycle. WP WP WP WP WP: Write Protect WP is the Write Protect pin. The Write Protect pin will allow normal read/write operations when held high. When WP is tied low and the WPEN bit in the status register is set to “1”, all write operations to the status register are inhibited. WP going low while CS is still low will interrupt a write to the status register. If the internal write cycle has already been initiated, WP going low will have no effect on any write operation to the status register. The WP pin function is blocked when the WPEN bit is set to 0. HOLD HOLD HOLD HOLD HOLD: Hold The HOLD pin is used to pause transmission to the CAT25C33/65 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 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 76543210 WPEN X X BP2 BP1 BP0 WEL RDY STATUS REGISTER BP2 BP1 BP0 0 0 0 Non-Protection 0 0 1 Q1 Protected 0 1 0 Q2 Protected 0 1 1 Q3 Protected 1 0 0 Q4 Protected 1 0 1 H1 Protected 1 1 0 P0 Protected 1 1 1 Pn Protected MEMORY PROTECTION CAT25C33 CAT25C65 Q1 0000-03FF 0000-07FF Q2 0400-07FF 0800-0FFF Q3 0800-0BFF 1000-17FF Q4 0C00-0FFF 1800-1FFF H1 0000-07FF 0000-0FFF P0 0000-003F 0000-003F Pn 0FC0-0FFF 0FC0-1FFF MEMORY PROTECTION |
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