m66291 Renesas Electronics Corporation., m66291 Datasheet - Page 73

• Manufacturer Part Number: m66291
• Description: Assp Usb2.0 Device Controller
• Manufacturer: Renesas Electronics Corporation.

M 6 6 2 9 1 G P / H P
R e v 1 . 0 1
(1) PIEN (Port Input Enable) Bits (b14~b8)
(2) PDIR (Port Input/Output Select) Bits (b6~b0)
These bits set the enable/disable of port input.
When “0” is written to this bit, the related port pin does not work as the input pin even if the PDIR bit of this
register is set to “0”. In this case the related port pin is in the high-impedance state. In this state, the port data
is read out as “0”.
When the PDIR bit of this register is set to “0”, the related port pin works as the input pin by writing “1” to
this bit.
When the PDIR bit of this register is set to “1”, these bits become invalid (and works as an output port).
These bits select input/output direction of the port pin.
2 0 0 4 . 1 1 . 0 1
p a g e 7 3 o f 1 2 2