HD6413003RVF RENESAS [Renesas Technology Corp], HD6413003RVF Datasheet - Page 262

• Manufacturer Part Number: HD6413003RVF
• Description: microcontroller (MCU)
• Manufacturer: RENESAS [Renesas Technology Corp]

9.2.4 Input Pull-Up Transistors
Port 4 has built-in MOS input pull-up transistors that can be controlled by software. These input
pull-up transistors can be used in 8-bit bus mode. They can be turned on and off individually.
In 8-bit bus mode, when a P4PCR bit is set to 1 and the corresponding P4DDR bit is cleared to 0,
the input pull-up transistor is turned on.
The input pull-up transistors are turned off by a reset and in hardware standby mode. In software
standby mode they retain their previous state.
Table 9-3 summarizes the states of the input pull-ups in the 8-bit and 16-bit bus modes.
Table 9-3 Input Pull-Up Transistor States (Port 4)
Mode
8-bit bus mode
16-bit bus mode
Legend
Off:
On/off: The input pull-up transistor is on if P4PCR = 1 and P4DDR = 0. Otherwise, it is off.
The input pull-up transistor is always off.
Figure 9-3 Pin Functions in 16-Bit Bus Mode (Port 4)
Reset
Off
Port 4
Hardware
Standby Mode
244
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
7
6
5
4
3
2
1
0
Software
Standby Mode
On/off
Off
Other Modes