HD64F3048VTF8 Datasheet, PDF (337/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip

Section 9 I/O Ports
9.12 Port B
9.12.1 Overview
Port B is an 8-bit input/output port that is also used for output (TP₁₅ to TP₈) from the
programmable timing pattern controller (TPC), input/output (TIOCB₄, TIOCB₃, TIOCA₄, TIOCA₃)
and output (TOCXB₄, TOCXA₄) by the 16-bit integrated timer unit (ITU), input (DREQ₁, DREQ₀)
to the DMA controller (DMAC), ADTRG input to the A/D converter, and CS₇ output. A reset or
hardware standby leaves port B as an input port. For selecting the pin function, see table 9.21.
Usage of pins for TPC, ITU, DMAC, and A/D converter input and output is described in the
sections on those modules. For output of CS₇ in modes 1 to 6, see section 6.3.2, Chip Select
Signals. Pins not assigned to any of these functions are available for generic input/output. Figure
9.11 shows the pin configuration of port B.
Pins in port B can drive one TTL load and a 30-pF capacitive load. They can also drive an LED or
darlington transistor pair. Pins PB₃ to PB₀ have Schmitt-trigger inputs.
Rev. 3.00 Sep 27, 2006 page 309 of 872
REJ09B0325-0300