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Section 8 I/O Ports
Rev. 6.00 Sep 12, 2006 page 181 of 526
REJ09B0326-0600
Upon reset, PDR3 is initialized to H'00.
Port Control Register 3 (PCR3)
Bit
7 6 5 4 3 2 1 0
PCR3
2
PCR3
1
PCR3
0
Initial
value 0 0 0 0 0 0 0 0
Read/Write
W W W
PCR3 is an 8-bit register for controlling whether each of the port 3 pins P3
2
to P3
0
functions as an
input pin or output pin. Setting a PCR3 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin. The settings in PCR3 and in PDR3 are valid only
when the corresponding pin is designated in PMR3 as a general I/O pin.
Upon reset, PCR3 is initialized to H'00.
PCR3 is a write-only register, which is always read as all 1s.
Port Pull-Up Control Register 3 (PUCR3)
Bit
7 6 5 4 3 2 1 0
PUCR3
2
PUCR3
1
PUCR3
0
Initial value
0
*
0
*
0
*
0
*
0
*
0 0 0
Read/Write
R/W R/W R/W
Note:
*
Bits 7 to 3 are reserved; they are always read as 0 and cannot be modified.
PUCR3 controls whether the MOS pull-up of each of the port 3 pins P3
2
to P3
0
is on or off. When
a PCR3 bit is cleared to 0, setting the corresponding PUCR3 bit to 1 turns on the MOS pull-up for
the corresponding pin, while clearing the bit to 0 turns off the MOS pull-up.
Upon reset, PUCR3 is initialized to H'00.
Port Mode Register 3 (PMR3)
Bit
7 6 5 4 3 2 1 0
SO1 SI1 SCK1
Initial
value 0 0 0 0 0 0 0 0
Read/Write
R/W R/W R/W
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...