MAX14500 Datasheet, PDF (34/41 Pages) Maxim Integrated Products – Hi-Speed USB-to-SD Card Readers with Bypass

Hi-Speed USB-to-SD Card
Readers with Bypass
Register Map (continued)
FIELD NAME
READ
WRITE
BITS
FORCEFS
R/W
1
RFU
R/W
0
CONFIG3: Configuration Register 3 (0x03)
SD2MAXCLK
R/W
[7:4]
SD1MAXCLK
R/W
[3:0]
IE1: Interrupt Enable Register 1 (0x04)
RFU
R/W
7
USBFS
R/W
6
USBSR
R/W
5
VTM
R/W
4
VSD
R/W
3
KVBUS
R/W
2
RESET
DESCRIPTION
Sets the maximum USB speed:
0
0 = Hi-Speed
1 = full speed
0
Reserved for future use
0000
0000
Limits the max clock for SD card 2. The SD clock will
be the minimum of either this register or the SD card
max speed register.
0111 = base SD clock/64
0110 = base SD clock/32
0101 = base SD clock/16
0100 = base SD clock/8
0011 = base SD clock/4
0010 = base SD clock/2
0001 = base SD clock
0000 = default (base SD clock)
Limits the max clock for SD card 1. The SD clock will
be the minimum of either this register or the SD card
max speed register.
0111 = base SD clock/64
0110 = base SD clock/32
0101 = base SD clock/16
0100 = base SD clock/8
0011 = base SD clock/4
0010 = base SD clock/2
0001 = base SD clock
0000 = default (base SD clock)
0
Reserved for future use
Full-speed status change:
0
0 = disable contribution to INT
1 = enable contribution to INT
USB suspend-resume status change:
0
0 = disable contribution to INT
1 = enable contribution to INT
V_TM voltage-detector change:
0
0 = disable contribution to INT
1 = enable contribution to INT
V_SD voltage-detector change:
0
0 = disable contribution to INT
1 = enable contribution to INT
VBUS voltage-detector change:
0
0 = disable contribution to INT
1 = enable contribution to INT
VALID
WHEN
Enter Card
Reader mode
—
Enter Card
Reader mode
Enter Card
Reader mode
—
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