Port B; Overview - Renesas F-ZTAT H8 Series Hardware Manual

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 (TP
programmable timing pattern controller (TPC), input/output (TIOCB
TIOCA ) and output (TOCXB
3
, DREQ ) to the DMA controller (DMAC), ADTRG input to the A/D converter, and CS
(DREQ
1 0
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 CS
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 PB
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, TOCXA ) by the 16-bit integrated timer unit (ITU), input
4 4
to PB have Schmitt-trigger inputs.
3 0
to TP ) from the
15 8
, TIOCB , TIOCA
4 3
in modes 1 to 6, see section 6.3.2,
7
,
4
7