HD64F3028F25 Datasheet, PDF (317/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

8.11 Port A
8.11.1 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 8.19 to 8.21 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 A₂₀ in modes 3, 4, and 5, 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 8.10 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. 2.00, 09/03, page 285 of 890