MAX14500 Datasheet, PDF (33/41 Pages) Maxim Integrated Products – Hi-Speed USB-to-SD Card Readers with Bypass

Hi-Speed USB-to-SD Card
Readers with Bypass
Register Map
FIELD NAME
READ
WRITE
CONTROL: Control Register (0x00)
RFU
R/W
BITS
[7:5]
SD2SW
R/W
4
SD1SW
R/W
3
MODE
R/W
[2:1]
WAKEUP
R/W
0
CONFIG1: Configuration Register 1 (0x01)
SD2ONEBIT
R/W
7
SD1ONEBIT
R/W
6
INTPULSE
R/W
5
INTACTHI
R/W
4
RFU
R/W
[3:0]
CONFIG2: Configuration Register 2 (0x02)
RFU
R/W
7
CLKSOURCE
R/W
[6:2]
RESET
DESCRIPTION
000 Reserved for future use
Setting of SD port 2 switches:
1 0 = open
1 = closed
Setting of SD port 1 switches:
1 0 = open
1 = closed
Activates PC USB Hi-Speed SD card reader:
00 = not active
00 01 = card reader active for SD port 1
10 = card reader active for SD port 2
11 = not active
Wakes the internal µC:
0 0 = requests µC to shut down
1 = wakes µC
0
0
0
0
0000
Force the SD port 2 bus to 1 bit mode:
0 = SD bus 4-bit data mode
1 = SD bus 1-bit data mode
Force the SD port 1 bus to 1 bit mode:
0 = SD bus 4-bit data mode
1 = SD bus 1-bit data mode
INT assertion method:
0 = INT stays asserted until STATUS register is read
1 = INT asserts for 10ms pulse
INT pin active level:
0 = active-low
1 = active-high
Reserved for future use
0
00000
Reserved for future use
Sets the configuration for the clock input:
00000 = default
00001 = 19.2MHz rail-to-rail square wave
00010 = 19.2MHz low-amplitude AC-coupled sine wave
00101 = 13MHz rail-to-rail square wave
00110 = 13MHz low-amplitude AC-coupled sine wave
01001 = 12MHz rail-to-rail square wave
01010 = 12MHz low-amplitude AC-coupled sine wave
01101 = 26MHz rail-to-rail square wave
01110 = 26MHz low-amplitude AC-coupled sine wave
All other values = default
VALID
WHEN
—
Powered
Powered
WAKEUP = 1
Powered
Enter Card
Reader mode
Enter Card
Reader mode
WAKEUP = 1
WAKEUP = 1
—
—
Enter Card
Reader mode
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