cy8c9520a Cypress Semiconductor Corporation., cy8c9520a Datasheet - Page 14

• Manufacturer Part Number: cy8c9520a
• Description: 20-, 40-, And 60-bit Io Expander With Eeprom
• Manufacturer: Cypress Semiconductor Corporation.

Read E2 POR Defaults Cmd (04h)
This command reads the POR settings stored in the EEPROM.
To read POR defaults the user must:
■
■
■
Write Device Config Cmd (05h)
This command sends a new device configuration to the
CY8C95xx. It is followed by 146 data bytes according to
Table
bytes (00h-91h). If the CRC check fails or an incomplete block is
sent, then the slave responds with a NAK and the device does
not use the data. This gives the user ‘flat-address-space’ access
to all device settings.
To set the current device configuration the user must:
■
■
■
If the CRC check passes, then the device uses the new settings
immediately.
Content of the data block is described in
Read Device Config Cmd (06h)
This command reads the current device configuration. It gives
the user ‘flat-address-space’ access to all device settings.
Document Number: 38-12036 Rev. *B
Write command 04h
Read 146 data bytes (see
Read 1 CRC byte.
Write command 05h
Write 146 data bytes with new values of registers
Write 1 CRC byte calculated as XOR of previous 146 data
bytes.
16. The CRC is calculated as the XOR of the 146 data
Table
16)
Table
16.
To read device configuration the user must:
■
■
■
Reconfigure Device Cmd (07h)
This command immediately reconfigures the device with actual
POR defaults from EEPROM. It has the same effect on the
registers as a POR.
Write command 06h
Read 146 data bytes (see
Read 1 CRC byte.
CY8C9520A, CY8C9540A
Table
16).
CY8C9560A
Page 14 of 24
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