MCP2221 datasheet(53/80 Pages) MICROCHIP

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DS20005292B-page 53

MCP2221

3.1.14

GET SRAM SETTINGS

This command is used to retrieve the run time Chip and

GP settings.

3.1.14.1

Responses

TABLE 3-38:

COMMAND STRUCTURE

Byte

Index

Value

Effect

0x61

Get SRAM Settings – command code echo

1-63

0x00

Command completed successfully

TABLE 3-39:

RESPONSE 1 STRUCTURE

Byte

Index

Function Description

Value

Effect

0x61

Get SRAM Settings – command code echo

0x00

Command completed successfully

Length in bytes of the SRAM

Chip-settings area.

Length in bytes of the SRAM GP

settings area.

Bit 7: CDC Serial Number Enumeration

Enable

The USB serial number will be used during the USB

enumeration of the CDC interface

No serial number descriptor will be presented during

the USB enumeration

Bit 6: Initial value for LEDUARTRX pin

option

This value represents the logic level signaled when no

UART RX activity takes places. When the UART RX (of

the MCP2221) is receiving data, the LEDUARTRX pin

will take the negated value of this bit.

Bit 5: Initial value for LEDUARTTX pin

option.

This value represents the logic level signaled when no

UART TX transmission takes place. When the UART

TX (of the MCP2221) is sending data, the LEDUARTTX

pin will take the negated value of this bit.

Bit 4: Initial value for LEDI2C pin option

This value represents the logic level signaled when no

I2C traffic occurs. When I2C traffic is active, the LEDI2C

pin (if enabled) will take the negated value of this bit.

Bit 3: Initial value for SSPND pin option

This value represents the logic level signaled when the

device is not in Suspend mode. Upon entering Suspend

mode, the SSPND pin (if enabled) will take the negated

value of this bit.

Bit 2: Initial value for USBCFG pin

option

This value represents the logic level signaled when the

device is not USB configured. When the device will be

USB-configured, the USBCFG pin (if enabled) will take

the negated value of this bit.

Bit 1-0: Chip configuration security

option

Permanently locked

Password-protected

Unsecured

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