73s1217f68im Maxim Integrated Products, Inc., 73s1217f68im Datasheet - Page 73
73s1217f68im
Manufacturer Part Number
73s1217f68im
Description
Bus-powered 80515 System-on-chip With Usb, Iso 7816 / Emv, Pinpad And More
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.73S1217F68IM.pdf
(140 pages)
- Current page: 73 of 140
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Keypad Scan Time Register (KSIZE): 0xD5
This register is not applicable when HWSCEN is not set. Unused row inputs should be connected to
VDD.
Keypad Column LS Scan Order Register (KORDERL): 0xD6
In the KORDERL and KORDERH registers, Column Scan Order(14:0) is grouped into 5 sets of 3 bits
each. Each set determines which column (COL(4:0) pin) to activate by loading the column number into
the 3 bits. When in HW_Scan_Enable mode, the hardware will step through the sets from 1Col to 5Col
(up to the number of columns in Colsize) and scan the column defined in the 3 bits. To scan in sequential
order, set a counting pattern with 0 in set 0, and 1 in set 1,and 2 in set 2, and 3 in set 3, and 4 in set 4.
The firmware should update this as part of the interrupt service routine so that the new scan order is
loaded prior to the next key being pressed. For example, to scan COL(0) first, 1Col(2:0) should be
loaded with 000’b. To scan COL(4) fifth, 5Col(2:0) should be loaded with 100’b.
Rev. 1.2
MSB
KORDERL.7
KORDERL.6
KORDERL.5
KORDERL.4
KORDERL.3
KORDERL.2
KORDERL.1
KORDERL.0
KSIZE.7
KSIZE.6
KSIZE.5
KSIZE.4
KSIZE.3
KSIZE.2
KSIZE.1
KSIZE.0
Bit
–
Bit
MSB
3COL.1
ROWSIZ.2
ROWSIZ.1
ROWSIZ.0
COLSIZ.2
COLSIZ.1
COLSIZ.0
–
Symbol
Symbol
3COL.1
3COL.0
2COL.2
2COL.1
2COL.0
1COL.2
1COL.1
1COL.0
3COL.0
–
–
ROWSIZ.2
Defines the number of rows in the keypad. Maximum number is 6 given
the number of row pins on the package. Allows for a reduced keypad size
for scanning.
Defines the number of columns in the keypad. Maximum number is 5
given the number of
keypad size for scanning.
Column to scan 3
Column to scan 2
Column to scan 1
2COL.2
Table 74: The KORDERL Register
Table 73: The KSIZE Register
ROWSIZ.1
2COL.1
rd
nd
st
.
0x00
.
(lsb’s).
ROWSIZ.0 COLSIZ.2 COLSIZ.1 COLSIZ.0
column pins on the package. Allows for a reduced
2COL.0
Function
Function
1COL.2
0x00
1COL.1
1COL.0
LSB
LSB
73
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