upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 38

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

3.9
ports, which can be set in the input or output mode in bit units by the register file shown below. When the mode is
changed from input to output, the P0B, P0E, and P1A output latch contents are output to the port lines as soon as
the mode has been changed.
38
An I/O that can be set to the input or output mode in bit units is called a bit I/O. P0B, P0E, and P1A are bit I/O
P0BBIO3
Switching Bit I/O (Port 0B, 0E, 1A)
3
P0BBIO2
2
P0BBIO1
1
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
P0BBIO0
Data Sheet U15002EJ1V1DS
0
RF: 26H
Address
P0BBIO0
P0BBIO1
P0BBIO2
P0BBIO3
0
1
0
1
0
1
0
1
After reset
Sets P0B
Sets P0B
Sets P0B
Sets P0B
Sets P0B
Sets P0B
Sets P0B
Sets P0B
0H
Sets P0B
0
0
1
1
Sets P0B
2
2
3
3
Sets P0B
Sets P0B
in input mode
in output mode
in input mode
in output mode
in input mode
in output mode
in input mode
in output mode
R/W
R/W
0
2
1
3
input/output mode
input/output mode
input/output mode
input/output mode