UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 163

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

5.5.4 Internal Pull-Up Resistors
and the mounting area to be reduced.
up resistor option register (PUO) and the port 3 mode register (PM3). When PUO3 is 1, the internal pull-up resistors of the pins
for which input is specified by PM3 (PM3n = 1, n = 0 to 7) are enabled.
also connected to pins that function as output pins in the control mode). Therefore, if you do not want to connect the pull-up
resistors in the control mode, the contents of the corresponding bits of PM3 should be set to 0 (output mode).
Port 3 incorporates pull-up resistors. Use of these internal resistors when pull-up is necessary enables the number of parts
Whether or not an internal pull-up resistor is to be used can be specified for each pin by means of the PUO3 bit of the pull-
Also, the specification for use of the pull-up resistor is also valid for pins specified as control mode pins (pull-up resistors are
Remark When STOP mode is entered, assigning 00H to PUO is effective in reducing the current consumption.
PUO
7
0
PUO6
6
PUO5
Figure 5-36 Pull-Up Resistor Option Register (PUO) Format
5
PUO4
4
PUO3
CHAPTER 5 PORT FUNCTIONS
3
PUO2
2
PUO1
1
PUO0
0
PUO3
0FF4EH
Address
0
1
Port 3 Pull-Up Resistor Specification
Not used in port 3
Used in port 3
On Reset
00H
R/W
R/W
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