73s1217f68im Maxim Integrated Products, Inc., 73s1217f68im Datasheet - Page 94

• Manufacturer Part Number: 73s1217f68im
• Description: Bus-powered 80515 System-on-chip With Usb, Iso 7816 / Emv, Pinpad And More
• Manufacturer: Maxim Integrated Products, Inc.

Card Status/Control Register (CRDCtl): 0xFE05
This register is used to configure the card detect pin (DETCARD) and monitor card detect status. This
register must be written to properly configure Debounce, Detect_Polarity (= 0 or = 1), and the pull-
up/down enable before setting CDETEN. The card detect logic is functional even without smart card logic
clock. When the PWRDN bit is set = 1, no debounce is provided but card presence is operable.
94
MSB
CRDCtl.7
CRDCtl.6
CRDCtl.5
CRDCtl.4
CRDCtl.3
CRDCtl.2
CRDCtl.1
CRDCtl.0
DEBOU
Bit
N
CDETEN
DEBOUN
CDETEN
DETPOL
CARDIN
Symbol
PUENB
PDEN
–
–
–
Debounce – When set = 1, this will enable hardware de-bounce
of the card detect pin. The de-bounce function shall wait for
64ms of stable card detect assertion before setting the CARDIN
bit. This counter/timer uses the keypad clock as a source of
1kHz signal. De-assertion of the CARDIN bit is immediate upon
de-assertion of the card detect pin(s).
Card Detect Enable – When set = 1, activates card detection
input. Default upon power-on reset is 0.
Detect Polarity – When set = 1, the DETCARD pin shall interpret
a logic 1 as card present.
Enable pull-up current on DETCARD pin (active low).
Enable pull-down current on DETCARD pin.
Card Inserted – (Read only). 1 = card inserted, 0 = card not
inserted. A change in the value of this bit is a “card event.” A
read of this bit indicates whether smart card is inserted or not
inserted in conjunction with the DETPOL setting.
Table 84: The CRDCtl Register
–
DETPOL
0x00
Function
PUENB
PDEN
CARDIN
LSB
Rev. 1.2