USB224X

DS00001979A-page 24

 2010 - 2015 Microchip Technology Inc.

7.2.4.1

A0h-A1h: Memory Stick Device Power Configuration

7.2.4.2

A2h-A3h: Not Applicable

7.2.4.3

A4h-A5h: xD-Picture Card Device Power Configuration

When applicable, the "SM" value will be overridden with “xD” once an xD-Picture Card has been identified.

7.2.4.4

A6h-A7h: Secure Digital Device Power Configuration

7.2.4.5

A8h: LED Blink Interval

FET

Type

Bits

Bit Type

Description

0

FET Lo Byte

MS_PWR_LB

3:0

Low Nibble

0000b Disabled

1

7:4

High Nibble

2

FET Hi Byte

MS_PWR_HB

3:0

Low Nibble

0000b Disabled

0001b External FET enabled

1000b Internal FET with 100 mA power limit

1010b Internal FET with 200 mA power limit

3

7:4

High Nibble

0000b Disabled

Byte

Name

Description

1:0

Not Applicable

Not applicable.

FET

Type

Bits

Bit Type

Description

0

FET Lo Byte

xD_PWR_LB

3:0

Low Nibble

0000b Disabled

1

7:4

High Nibble

2

FET Hi Byte

xD_PWR_HB

3:0

Low Nibble

0000b Disabled

0001b External FET enabled

1000b Internal FET with 100 mA power limit

1010b Internal FET with 200 mA power limit

3

7:4

High Nibble

0000b Disabled

FET

Type

Bits

Bit Type

Description

0

FET Lo Byte

SD_PWR_LB

3:0

Low Nibble

0000b Disabled

1

7:4

High Nibble

2

FET Hi Byte

SD_PWR_HB

3:0

Low Nibble

0000b Disabled

0001b External FET enabled

1000b Internal FET with 100 mA power limit

1010b Internal FET with 200 mA power limit

3

7:4

High Nibble

0000b Disabled

Byte

Name

Description

0

LED_BLK_INT

The blink rate is programmable in 50 ms intervals. The high bit (7) indicates

an idle state:

‘0’ - Off

‘1’ - On

The remaining bits (6:0) are used to determine the blink interval up to a max

of 128 x 50 ms.