73S1215F Maxim, 73S1215F Datasheet - Page 67
73S1215F
Manufacturer Part Number
73S1215F
Description
The Teridian 73S1215F is a self-contained SoC smart card reader IC that is an ideal solution for any USB-connected ISO 7816 design
Manufacturer
Maxim
Datasheet
1.73S1215F.pdf
(136 pages)
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DS_1215F_003
Rev. 1.4
No
KORDERL / H Registers:
Column Scan Order
still released ?
Yes
Deboucing
the key(s)
Is (are)
Timer
(*)
1 key
More
than
Figure 13: Keypad Interface Flow Chart
No
Yes
Debouncing Time
KSCAN Register:
Download of the key row and
column values in KROW and
(*) Key release is cheked by looking for a low level on any row.
Keypad Scanning
Keypad Interrupt
keys have been
KCOL registers
Input still = 0 ?
Initialization
Outputs = 0
All Column
Input = 0 ?
Deboucing
How Many
generation
released ?
detected?
the key(s)
Any Row
Keypad
Is (are)
Timer
1 key
Row
Any
Yes
(*)
No
0 key
No
Debouncing Time
KSCAN Register:
Keypad Size Definition
Enable Keypad Interrupt
KSCAN Register:
Enable HW Scanning
KSIZE Register:
Scanning Rate
KSTAT Register:
Value of the valid key column
Key Detect Interrupt
KSTAT Register:
Value of the valid key row
Register written by the
hardware keypad interface
Register Used to Control the
hardware keypad interface
KROW Register:
KCOL Register:
73S1215F Data Sheet
67
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