HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 154

• 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

7.5.2
Table 7.8 summarizes the port 4 registers.
Table 7.8
Name
Port 4 data direction register
Port 4 data register
Port 4 Data Direction Register (P4DDR)
P4DDR is an 8-bit register that controls the input/output direction of each pin in port 4. A pin
functions as an output pin if the corresponding P4DDR bit is set to 1, and as an input pin if this bit
is cleared to 0.
P4DDR is a write-only register. Read data is invalid. If read, all bits always read 1.
P4DDR 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 P4DDR bit
is set to 1, the corresponding pin remains in the output state.
If a transition to software standby mode occurs while port 4 is being used by an on-chip
supporting module (for example, for 8-bit timer output), the on-chip supporting module will be
initialized, so the pin will revert to general-purpose input/output, controlled by P4DDR and P4DR.
122
Bit
Initial value
Read/Write
Register Configuration and Descriptions
Port 4 Registers
P4
7
W
7
DDR P4
0
6
W
6
DDR P4
0
Abbreviation
P4DDR
P4DR
5
W
5
DDR P4
0
Read/Write
W
R/W
4
W
4
DDR P4
0
3
W
3
DDR P4
0
Initial Value
H'00
H'00
2
W
2
DDR P4
0
1
W
1
DDR P4
0
Address
H'FFB5
H'FFB7
0
W
0
DDR
0