upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 359

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

14.2.3 Port 2
in 1-bit units (software pull-up function).
Port 2
Port 2 is an 8-bit I/O port for which I/O settings can be controlled in 1-bit units. A pull-up resistor can be connected
P21 and P22 are selectable as normal outputs or N-ch open-drain outputs.
When P26 and P27 are used as the TI2/TI3 pins, noise is eliminated from these pins by a digital noise eliminator.
Remark
Port 2 includes the following alternate functions.
Note Software pull-up function
After reset:
P2
Pin Name
In input mode:
In output mode:
P20
P21
P22
P23
P24
P25
P26
P27
00H
P2n
0
1
P27
7
Output 0
Output 1
SO2
TXD1
TI2/TO2
TI3/TO3
SI2
SCK2
RXD1
ASCK1
R/W
P26
When port 2 (P2) is read, the pin levels at that time are read. Writing to P2
writes the values to that register. This does not affect the input pins.
When port 2 (P2) is read, the P2 values are read.
writes the values to that register, and those values are immediately output.
6
Alternate Function
Table 14-4. Alternate Functions of Port 2
CHAPTER 14 PORT FUNCTION
User’s Manual U12768EJ4V1UD
P25
Control of Output Data (in Output Mode) (n = 0 to 7)
5
Address: FFFFF004H
P24
4
I/O
I/O
PULL
Yes
P23
3
Note
Selectable as N-ch open-drain output
Digital noise elimination
P22
2
Remark
−
−
P21
1
Writing to P2
P20
0
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