upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 368

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

(1) Function of P3 pins
(2) Control registers
368
After reset:
PU3
Port 3 is an 8-bit I/O port for which I/O settings can be controlled in 1-bit units. I/O settings are controlled via the
port 3 mode register (PM3).
In output mode, the values set to each bit are output to port 3 (P3).
When using this port in input mode, the pin statuses can be read by reading P3. Also, the P3 (output latch) values
can be read by reading P3 while in output mode.
A pull-up resistor can be connected in 1-bit units when specified via pull-up resistor option register 3 (PU3).
When using the alternate-function TI4 and TI5 pins, noise elimination is provided by a digital noise eliminator
(same as digital noise eliminator for port 0).
When using the alternate-function A13 to A15 pins, set the pin functions via the memory address output mode
register (MAM). At this time, be sure to set PM3 (PM34 to PM36) to 0.
Clear P3 and PM3 to 0 when using alternate-function pins as outputs. The ORed result of the port output and the
alternate-function pin is output from the pins.
When a reset is input, the settings are initialized to input mode.
(a) Port 3 mode register (PM3)
(b) Pull-up resistor option register 3 (PU3)
After reset:
PM3
PM3 can be read/written in 1-bit or 8-bit units.
PU3 can be read/written in 1-bit or 8-bit units.
FFH
00H
PM3n
PU3n
0
1
0
1
PM37
PU37
7
7
Output mode
Input mode
Do not connect
Connect
R/W
R/W
PU36
PM36
6
6
CHAPTER 14 PORT FUNCTION
PU35
Control of On-Chip Pull-Up Resistor Connection (n = 0 to 7)
PM35
User’s Manual U12768EJ4V1UD
5
5
Address: FFFFF086H
Address: FFFFF026H
PU34
PM34
Control of I/O Mode (n = 0 to 7)
4
4
PU33
PM33
3
3
PM32
PU32
2
2
PM31
PU31
1
1
PM30
PU30
0
0