DS_1210F_001
73S1210F Data Sheet
Keypad Column LS Scan Order Register (KORDERL): 0xD6 0x00
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.
Table 69: The KORDERL Register
MSB
LSB
3COL.1 3COL.0 2COL.2 2COL.1 2COL.0 1COL.2 1COL.1 1COL.0
Bit
Symbol
3COL.1
3COL.0
2COL.2
2COL.1
2COL.0
1COL.2
1COL.1
1COL.0
Function
KORDERL.7
KORDERL.6
KORDERL.5
KORDERL.4
KORDERL.3
KORDERL.2
KORDERL.1
KORDERL.0
Column to scan 3rd (lsb’s).
Column to scan 2nd.
Column to scan 1st.
Keypad Column MS Scan Order Register (KORDERH): 0xD7 0x00
Table 70: The KORDERH Register
MSB
LSB
5COL.2 5COL.1 5COL.0 4COL.2 4COL.1 4COL.0 3COL.2
–
Bit
Symbol
–
Function
KORDERH.7
KORDERH.6
KORDERH.5
KORDERH.4
KORDERH.3
KORDERH.2
KORDERH.1
KORDERH.0
5COL.2
5COL.1
5COL.0
4COL.2
4COL.1
4COL.0
3COL.2
Column to scan 5th.
Column to scan 4th.
Column to scan 3rd (msb).
Rev. 1.4
67
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
