HD6432621 Hitachi, HD6432621 Datasheet - Page 316

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

9.9.4
Port E has a built-in MOS input pull-up function that can be controlled by software. This MOS
input pull-up function can be used in modes 4 to 6 when 8-bit bus mode is selected, or in mode 7,
and can be specified as on or off on an individual bit basis.
When a PEDDR bit is cleared to 0 in modes 4 to 6 when 8-bit bus mode is selected, or in mode 7,
setting the corresponding PEPCR bit to 1 turns on the MOS input pull-up for that pin.
The MOS input pull-up function is in the off state after a reset, and in hardware standby mode.
The prior state is retained in software standby mode.
Table 9-20 summarizes the MOS input pull-up states.
Table 9-20 MOS Input Pull-Up States (Port E)
Modes
7
4 to 6
Legend:
OFF
ON/OFF : On when PEDDR = 0 and PEPCR = 1; otherwise off.
272
MOS Input Pull-Up Function
: MOS input pull-up is always off.
8-bit bus
16-bit bus
Power-On
Reset
OFF
Hardware
Standby Mode
OFF
Software
Standby Mode
ON/OFF
OFF
In Other
Operations
ON/OFF
OFF