USB5533B datasheet(16/71 Pages) MICROCHIP

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USB5533B

DS00001680C-page 16

 2012 - 2015 Microchip Technology Inc.

4.1.4.1

ERASE EXAMPLE

To perform a SCTR_ERASE, 32BLK_ERASE, or 64BLK_ERASE, the device writes 0x20, 0x52, or 0xD8, respectively

to the first byte of the command buffer, followed by a 3-byte address. The length of the transfer is set to 4 bytes. To do

this, the device first drops SPI_CE_N, then counts out 8 clocks. It then puts out the 8 bits of command, followed by 24

bits of address of the location to be erased on the SPI_DO pin. When the transfer is complete, the SPI_CE_N goes high,

while the SPI_DI line is ignored in this example.

4.1.4.2

BYTE PROGRAM EXAMPLE

To perform a Byte Program, the device writes 0x02 to the first byte of the command buffer, followed by a 3-byte address

of the location that will be written to, and one data byte. The length of the transfer is set to 5 bytes. The device first drops

SPI_CE_N, 8 bits of command are clocked out, followed by 24 bits of address, and one byte of data on the SPI_DO pin.

The SPI_DI line is not used in this example.

FIGURE 4-6:

SPI ERASE SEQUENCE

FIGURE 4-7:

SPI BYTE PROGRAM

SPI_CEN

SPI_CLK

23 24

12 3 4

ADD.

SPI_DO

SPI_DI

Command

MSB

ADD.

HIGH IMPEDANCE

SPI_CEN

SPI_CLK

23 24

12 3 4

0x00

SPI_DO

SPI_DI

0xDB

MSB

0xFE

/0xFF

Data

MSB

LSB

HIGH IMPEDANCE

0xBF

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