Rev. 1.0, 09/02, page 131 of 568
Bit
Bit Name
Initial Value
R/W
Description
7 P37
Undefined
*
R
6 P36
Undefined
*
R
5 P35
Undefined
*
R
4 P34
Undefined
*
R
3 P33
Undefined
*
R
2 P32
Undefined
*
R
1 P31
Undefined
*
R
0 P30
Undefined
*
R
If a port 3 read is performed while P3DDR bits are
set to 1, the P3DR values are read. If a port 3 read is
performed while P3DDR bits are cleared to 0, the pin
states are read.
Note:
*
Determined by the states of pins P37 to P30.
9.2.4
Port 3 Open-Drain Control Register (P3ODR)
P3ODR is an 8-bit readable/writable register that specifies the output type of port 3.
Bit
Bit Name
Initial Value
R/W
Description
7 P37ODR 0
R/W
6 P36ODR 0
R/W
5 P35ODR 0
R/W
4 P34ODR 0
R/W
3 P33ODR 0
R/W
2 P32ODR 0
R/W
1 P31ODR 0
R/W
0 P30ODR 0
R/W
When a pin is specified as an output port, setting the
corresponding bit to 1 specifies pin output to open-
drain and the input pull-up MOS to the off state.
Clearing this bit to 0 specifies that to push-pull
output.
Note:
*
Determined by the states of pins P47 to P40.
9.2.5 Pin
Functions
Port 3 pins also function as SCI_0 I/O pins and interrupt input pins. The correspondence between
the register specification and the pin functions is shown below.
Table 9.10 P37 Pin Function
P37DDR 0
1
Pin function
P37 input
P37 output
Summary of Contents for H8S/2627
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