73s1210f68im Maxim Integrated Products, Inc., 73s1210f68im Datasheet - Page 85
73s1210f68im
Manufacturer Part Number
73s1210f68im
Description
Self-contained Smart Card Reader With Pinpad And Power Management
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.73S1210F68IM.pdf
(126 pages)
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DS_1210F_001
Card Status/Control Register (CRDCtl): 0xFE05 0x00
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.
Rev. 1.4
MSB
DEBOUN CDETEN
CRDCtl.7
CRDCtl.6
CRDCtl.5
CRDCtl.4
CRDCtl.3
CRDCtl.2
CRDCtl.1
CRDCtl.0
Bit
DEBOUN
CDETEN
DETPOL
CARDIN
Symbol
PUENB
PDEN
–
–
–
Debounce - When set = 1, this will enable hardware debounce of
the card detect pin. The debounce 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 77: The CRDCtl Register
–
DETPOL
Function
PUENB
PDEN
73S1210F Data Sheet
CARDIN
LSB
85
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