UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 150

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

5.4.2 Input Mode/Control Mode Setting
individual internal hardware items.
5.4.3 Operating Status
5.4.4
parts and the mounting area to be reduced.
the PUO2 bit of the pull-up resistor option register (PUO) (bit-wise specification is not possible).
110
Port 2 is an input-only port, and there is no register for setting the input mode.
Also, control signal input is always possible, and therefore the signal to be used is determined by the control registers for
Port 2 is an input-only port, and pin levels can always be read or tested.
P22 to P27 incorporate pull-up resistors. Use of these internal resistors when pull-up is necessary enables the number of
Whether or not an internal pull-up resistor is to be used can be specified for all six pins, P22 to P27, together by means of
P20 and P21 do not incorporate a pull-up resistor.
Remark When STOP mode is entered, assigning 00H to PUO is effective in reducing the current consumption.
PUO
Internal Pull-Up Resistors
7
0
PUO6
6
PUO5
Figure 5-25 Pull-Up Resistor Option Register (PUO) Format
Internal
5
Bus
PUO4
4
Figure 5-24 Port Specified as Input Port
PUO3
CHAPTER 5 PORT FUNCTIONS
RD
3
IN
PUO2
2
PUO1
1
PUO0
0
PUO2
0FF4EH
Address
0
1
Port 2 Pull-Up Resistor Specification
Not used in port 2
Used in pins P22 to P27
On Reset
P2n
n = 0-7
00H
R/W
R/W