Section 8
I/O Ports
Rev. 1.00 Mar. 12, 2008 Page 283 of 1178
REJ09B0403-0100
8.2.3 Port
3
Port 3 is an 8-bit I/O port. Port 3 pins can also function as the bidirectional data bus and de-
bounced input pins. The pin functions change according to the operating mode. Port 3 has the
following registers.
•
Port 3 data direction register (P3DDR)
•
Port 3 data register (P3DR)
•
Port 3 pull-up MOS control register (P3PCR)
•
Noise canceler enable register (P3NCE)
•
Noise canceler mode control register (P3NCMC)
•
Noise cancel cycle setting register (NCCS)
(1)
Port 3 Data Direction Register (P3DDR)
The individual bits of P3DDR specify input or output for the port 3 pins.
Bit
Bit Name
Initial Value
R/W Description
7 P37DDR
0
W
6 P36DDR
0
W
5 P35DDR
0
W
4 P34DDR
0
W
3 P33DDR
0
W
2 P32DDR
0
W
1 P31DDR
0
W
0 P30DDR
0
W
•
Normal extended mode (ADMXE = 0)
The pins function as bidirectional data bus pins.
•
Other modes
When set to 1, the corresponding pins function as
output port pins; when cleared to 0, function as input
port pins.
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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