HD6413007F20 Datasheet, PDF (295/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

8. I/O Ports
8.7 Port A
8.7.1 Overview
Port A is an 8-bit input/output port that is also used for output (TP₇ to TP₀) from the programmable
timing pattern controller (TPC), input and output, (TIOCB₂, TIOCA₂, TIOCB₁, TIOCA₁, TIOCB₀,
TIOCA₀, TCLKD, TCLKC, TCLKB, TCLKA) by the 16-bit timer, input (TCLKD, TCLKC,
TCLKB, TCLKA) to the 8-bit timer, output (TEND₁, TEND₀) from the DMA controller (DMAC),
and address output (A₂₃ to A₂₀). A reset or hardware standby transition leaves port A as an input
port, except that in modes 3 and 4, one pin is always used for A₂₀ output. See table 8.12 to 8.14 for
the selection of pin functions.
Usage of pins for TPC, 16-bit timer, 8-bit timer, and DMAC input and output is described in the
sections on those modules. For output of address bits A₂₃ to A₂₁ in modes 3 and 4, see section
6.2.4, Bus Release Control Register (BRCR). Pins not assigned to any of these functions are
available for generic input/output. Figure 8.6 shows the pin configuration of port A.
Pins in port A can drive one TTL load and a 30-pF capacitive load. They can also drive a
darlington transistor pair. Port A has Schmitt-trigger inputs.
Rev.5.00 Sep. 12, 2007 Page 265 of 764
REJ09B0396-0500