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Chapter 16
Port Functions
Preliminary User’s Manual U14913EE1V0UM00
16.8 Port
CT
Port CT is an 8-bit input/output port in which input or output can be specified in 1-bit units.
Figure 16-39: Port CT (PCT)
Besides functioning as a port, in control mode, this can operate as control signal outputs when memory
is expanded externally. It also can operate as segment signal output of LCD controller/driver.
(1)
Operation in control mode
(2)
Setting in input/output mode and control mode
Port CT is set in input/output mode using the port CT mode register (PMCT). In control mode, it is
set using the port CT mode control register (PMCCT).
(a) Port CT mode register (PMCT)
This register can be read or written in 8- or 1-bit units.
Figure 16-40: Port CT Mode Register (PMCT)
7
6
5
4
3
2
1
0
Address
At Reset
PCT
x
x
x
PCT4
PCT3
PCT2
PCT1
PCT0
FFFFF00AH
FFH
Bit Position
Bit Name
Function
7 to 0
PCTn
(n = 4 to 0)
Input/output port
Port
Alternate Pin
Name
Remarks
Block type
Port CT
PCT0
LWR/SEG27
Write strobe signal output or segment signal out-
put of LCD-controller
F
PCT1
UWR/SEG28
PCT2
SEG29
Segment signal output of LCD-controller
PCT3
SEG30
PCT4
RD/SEG31
Read strobe signal output or segment signal out-
put of LCD-controller
7
6
5
4
3
2
1
0
Address
At Reset
PMCT
1
1
1
PMCT4
PMCT3
PMCT2
PMCT1
PMCT0
FFFFF02AH
FFH
Bit Position
Bit Name
Function
7 to 0
PMCTn
(n = 4 to 0)
Specifies input/output mode of PCTn pin.
0: Output mode (Output buffer on)
1: Input mode (Output buffer off)
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