HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 297

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HD6433044

Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet

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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
(DREQ
output. A reset or hardware standby leaves port B as an input port. 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
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
3
1
) and output (TOCXB
, DREQ
7
in modes 1 to 6, see section 6.3.2, Chip Select Signals. Pins not assigned to any of
0
) to the DMA controller (DMAC), ADTRG input to the A/D converter, and CS
4
, TOCXA
3
to PB
0
4
) by the 16-bit integrated timer unit (ITU), input
have Schmitt-trigger inputs.
284
15
to TP
4
, TIOCB
8
) from the
3
, TIOCA
4
,
7

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