HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 149

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.4.2
Table 7.6 summarizes the port 3 registers.
Table 7.6
Name
Port 3 data direction register
Port 3 data register
Port 3 input pull-up control
register
Port 3 Data Direction Register (P3DDR)
P3DDR is an 8-bit register that controls the input/output direction of each pin in port 3. P3DDR is
a write-only register. Read data is invalid. If read, all bits always read 1.
Modes 1 and 2: In mode 1 (expanded mode with on-chip ROM disabled) and mode 2 (expanded
mode with on-chip ROM enabled), the input/output directions designated by P3DDR are ignored.
Port 3 automatically consists of the input/output pins of the 8-bit data bus (D
The data bus is in the high-impedance state during reset, and during hardware and software
standby.
Mode 3: A pin in port 3 is used for general output if the corresponding P3DDR bit is set to 1, and
for general input if this bit is cleared to 0. P3DDR is initialized to H'00 by a reset and in hardware
standby mode. In software standby mode it retains its existing values, so if a transition to software
standby mode occurs while a P3DDR bit is set to 1, the corresponding pin remains in the output
state.
Bit
Initial value
Read/Write
Register Configuration and Descriptions
Port 3 Registers
P3
7
W
7
DDR P3
0
6
W
6
DDR P3
0
Abbreviation
P3DDR
P3DR
P3PCR
5
W
5
DDR P3
0
Read/Write
W
R/W
R/W
4
W
4
DDR P3
0
3
W
3
DDR P3
0
Initial Value
H'00
H'00
H'00
2
W
2
DDR P3
0
7
to D
1
0
W
1
DDR P3
0
).
Address
H'FFB4
H'FFB6
H'FFAE
0
W
0
DDR
0
117