upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 41

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

3.11 Selecting Whether Key Matrix Is Used or Not (Port 0E, 1A)
By using the following register file, whether P0E and P1A are used for a key matrix can be selected in bit units.
P0EKEY3
3
0
3
P1AKEY2
P0EKEY2
2
2
P1AKEY1
P0EKEY1
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
1
1
P1AKEY0
P0EKEY0
0
0
Data Sheet U15002EJ1V1DS
P1AKEY0
P1AKEY1
P1AKEY2
P0EKEY0
P0EKEY1
P0EKEY2
P0EKEY3
Address
RF: 06H
Address
RF: 16H
0
1
0
1
0
1
0
1
0
1
0
1
0
1
P1A
P1A
P1A
P1A
P1A
P1A
P0E
P0E
P0E
P0E
P0E
P0E
P0E
P0E
Selects whether P1A
Selects whether P1A
Selects whether P1A
Selects whether P0E
Selects whether P0E
Selects whether P0E
Selects whether P0E
0
0
1
1
2
2
0
0
1
1
2
2
3
3
After reset
After reset
not used for key matrix
used for key matrix
not used for key matrix
used for key matrix
not used for key matrix
used for key matrix
not used for key matrix
used for key matrix
not used for key matrix
used for key matrix
not used for key matrix
used for key matrix
not used for key matrix
used for key matrix
0H
0H
R/W
R/W
R/W
R/W
0
2
1
0
1
2
3
is used for key matrix or not
is used for key matrix or not
is used for key matrix or not
is used for key matrix or not
is used for key matrix or not
is used for key matrix or not
is used for key matrix or not
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