73S1209F Maxim, 73S1209F Datasheet - Page 63

• Manufacturer Part Number: 73S1209F
• Description: The 73S1209F is a self-contained, SoC smart card reader IC that is an ideal solution for serially connected ISO 7816 design
• Manufacturer: Maxim

DS_1209F_004
Rev. 1.2
No
KORDERL / H Registers:
Column Scan Order
still released ?
Yes
Deboucing
the key(s)
Is (are)
Timer
(*)
More
1 key
than
Figure 12: Keypad Interface Flow Chart
No
(*) Key release is cheked by looking for a low level on any row.
Yes
Debouncing Time
KSCAN Register:
Download of the key row and
column values in KROW and
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
KSCAN Register:
Debouncing Time
Keypad Size Definition
Enable Keypad Interrupt
Enable HW Scanning
KSCAN Register:
KSIZE Register:
Scanning Rate
KSTAT Register:
Value of the valid key column
Key Detect Interrupt
KSTAT Register:
Value of the valid key row
KROW Register:
Register written by the
hardware keypad interface
KCOL Register:
Register Used to Control the
hardware keypad interface
73S1209F Data Sheet
63