Section 8
I/O Ports
Rev. 1.00 Mar. 12, 2008 Page 229 of 1178
REJ09B0403-0100
8.1.8 Port
8
Port 8 is an 8-bit I/O port. Port 8 pins can also function as the A/D converter external trigger input,
SCI_1 and SCI_3 input/output, IIC_0 and IIC_1 input/output, and interrupt input pins. Pins 83 to
80 perform the NMOS push-pull output. Port 8 has the following registers.
•
Port 8 data direction register (P8DDR)
•
Port 8 data register (P8DR)
(1)
Port 8 Data Direction Register (P8DDR)
The individual bits of P8DDR specify input or output for the port 8 pins.
Bit
Bit Name
Initial Value
R/W Description
7 P87DDR
0
W
6 P86DDR
0
W
5 P85DDR
0
W
4 P84DDR
0
W
3 P83DDR
0
W
2 P82DDR
0
W
1 P81DDR
0
W
0 P80DDR
0
W
If port 8 pins are specified for use as the general I/O
port, the corresponding pins function as output port
when the P8DDR bits are set to 1, and as input port
when cleared to 0.
Since this register is allocated to the same address as
PBPIN, states of the port 8 pins are when this register
is read.
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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