HD643303x Hitachi, HD643303x Datasheet - Page 153

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

7.5.4 Input Pull-Up Transistors
Port 5 has built-in MOS pull-up transistors that can be controlled by software. These input pull-up
transistors can be turned on and off individually.
When a P5PCR bit is set to 1 and the corresponding P5DDR 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 7-7 summarizes the states of the input pull-up transistors in each mode.
Table 7-7 Input Pull-Up Transistor States (Port 5)
Mode
1
2
3
Legend
Off:
On/off: The input pull-up transistor is on if P5PCR = 1 and P5DDR = 0. Otherwise, it is off.
The input pull-up transistor is always off.
Reset
Off
Hardware Standby Mode
Off
138
Software Standby Mode
On/off
Other Modes
On/off