m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 76

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

Fig. 5.2.2 Structure of port Pi (i = 1, 2, 4 to 8) direction register
5.2.1 Direction register
This register determines the I/O direction of programmable I/O ports. One bit of this register corresponds
to one pin of the microcomputer, and this is the one-to-one relationship.
Figure 5.2.2 shows the structure of port Pi (i = 1, 2, 4 to 8) direction register.
Port Pi direction register (i = 1, 2, 4 to 8)
(Addresses 5
Notes 1: Nothing is assigned for bits 0 and 4 of the port P5 direction register. These bits are undefined at reading.
Bit
0
1
2
3
4
5
6
7
2: Nothing is assigned for bits 4 to 7 of the port P8 direction register. These bits are undefined at reading.
3: Any of bits 0 to 7 of the port P4 direction register becomes “0” by input of a falling edge to pin P4OUT
4: Any of bits 0 to 7 of the port P6 direction register becomes “0” by input of a falling edge to pin P6OUT
section “5.2.3 Pin P4OUT
section “5.2.4 Pin P6OUT
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
Port Pi
16
, 8
0
1
2
3
4
5
6
7
16
direction bit
direction bit
direction bit
direction bit
direction bit
direction bit
direction bit
direction bit
, C
Bit name
16
, D
16
, 10
16
CUT
CUT
, 11
/INT
/INT
16,
0
4
.”)
.”)
14
7905 Group User’s Manual Rev.1.0
16
)
0 : Input mode
1 : Output mode
(The port functions as an input port.)
(The port functions as an output port.)
Function
INPUT/OUTPUT PINS
5.2 Programmable I/O ports
b7 b6 b5 b4 b3 b2 b1 b0
At reset
CUT
CUT
0
0
0
0
0
0
0
0
/INT
/INT
0
4
. (Refer to
. (Refer to
R/W
RW
RW
RW
RW
RW
RW
RW
RW
5-3