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Peripheral Functions
6. I/O Ports
The H8/300L Series microcomputers provide I/O ports that are optimal for application
embedded microcontrollers. In addition to general purpose bidirectional (input and output)
ports, the H8/300L Series microcomputers also provide a set of specialized I/O ports that differ
between products and that include real time ports that allow immediate output control in
response to external events, high current ports that can drive LEDs, and high breakdown
voltage (40 V) ports with built-in pull-down MOS transistors.
Port Functions
General Purpose I/O Ports: General purpose I/O ports include a port data register (PDR) that
holds the data value to be output from the port and a port control register that determines the
direction of the port. Additionally, ports that are allocated to share functions with peripheral
module dedicated I/O signals also have a port mode register that switches the pin function.
V
V
CC
Option
P1
n
V
<Notation>
PDR 1:
Port data register 1
PMR 1:
Port mode register 1
PCR 1:
Port control register 1
n = 0 to 4
Note: The figure shows the H8/3724 port 1.
CC
SS
STBY
PDR 1 bit n
PMR 1 bit n
PCR 1 bit n
102
IRQ
P1
:
IRQ
0
0
P1
:
IRQ
1
1
P1
:
IRQ
2
2
P1
:
IRQ
3
3
P1
:
IRQ
4
4
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