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CAT25C64U20A-TE13 Fiches technique(PDF) 6 Page - Catalyst Semiconductor |
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CAT25C64U20A-TE13 Fiches technique(HTML) 6 Page - Catalyst Semiconductor |
6 / 9 page 6 CAT25C32/64 Doc. No. 25087-00 8/99 SPI-1 Advanced Information After the correct read instruction and address are sent, the data stored in the memory at the selected address is shifted out on the SO pin. The data stored in the memory at the next address can be read sequentially by continu- ing to provide clock pulses. The internal address pointer is automatically incremented to the next higher address after each byte of data is shifted out. When the highest address (1FFFh for 25C64 and FFFh for 25C32) is reached, the address counter rolls over to 0000h allow- ing the read cycle to be continued indefinitely. The read operation is terminated by pulling the CS high. To read the status register, RDSR instruction should be sent. The contents of the status register are shifted out on the SO line. The status register may be read at any time even during a write cycle. Read sequece is illustrated in Figure 4. Reading status register is illustrated in Figure 5. Figure 2. WREN Instruction Timing Figure 3. WRDI Instruction Timing DEVICE OPERATION Write Enable and Disable The CAT25C32/64 contains a write enable latch. This latch must be set before any write operation. The device powers up in a write disable state when Vcc is applied. WREN instruction will enable writes (set the latch) to the device. WRDI instruction will disable writes (reset the latch) to the device. Disabling writes will protect the device against inadvertent writes. READ Sequence The part is selected by pulling CS low. The 8-bit read instruction is transmitted to the CAT25C32/64, followed by the 16-bit address(the three Most Significant Bits are don’t care for 25C64 and four most significant bits are don't care for 25C32). Note: Dashed Line= mode (1, 1) — — — — Note: Dashed Line= mode (1, 1) — — — — SK SI CS SO 00000 11 0 HIGH IMPEDANCE SK SI CS SO 00000 10 0 HIGH IMPEDANCE |
Numéro de pièce similaire - CAT25C64U20A-TE13 |
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Description similaire - CAT25C64U20A-TE13 |
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