CHAPTER 12 PORT FUNCTIONS
User’s Manual U12688EJ4V0UM00
380
(c) Port/control select register 3 (PCS3)
This register can be read/written in 8- or 1-bit units. However, except for bit 5, all the bits are fixed at 0,
so even if 1 is written, it is disregarded.
0
0
Address
FFFFF586H
After reset
00H
1
0
2
0
3
0
4
0
5
PCS35
6
0
7
0
PCS3
Bit Position
Bit Name
Function
5
PCS35
Port Control Select
Specifies the operating mode when pins P37 to P35 are in the control mode.
0:
INTP133 input mode (P37)
INTP132 input mode (P36)
INTP131 input mode (P35)
1: SCK2 input/output mode (P37)
SI2 input mode (P36)
SO2 output mode (P35)
Caution When the port mode is specified by the PMC3 register, the settings of this register are ignored.
12.3.5 Port 4
Port 4 is an 8-bit input/output port that can be set to input or output in 1-bit units.
Address
FFFFF008H
7
P47
P4
6
P46
5
P45
4
P44
3
P43
2
P42
1
P41
0
P40
After reset
Undefined
Bit Position
Bit Name
Function
7 to 0
P4n (n = 7 to 0)
Port 4
Input/output port
In addition to their function as port pins, the port 4 pins can also operate in the control mode (external expansion
mode) as a data bus used when memory is expanded externally.
(1) Operation in control mode
Port
Control Mode
Remark
Block Type
Port 4
P40 to P47
D0 to D7
Data bus in memory expansion
E
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