955
Chapter 20
Port Functions
User’s Manual U16580EE3V1UD00
20.3.17 Port
CT
Port CT is a 2-bit I/O port that can be set to input or output mode in 1-bit units.
(1)
Functions
•
Input/output data can be specified in 1-bit units by using the port register CT (PCT).
•
Input or output mode can be set in 1-bit units by using the port mode register CT (PMCT).
•
Port mode or control mode (for alternate function) can be specified in 1-bit units by using the
port mode control register CT (PMCCT).
Table 20-20:
Alternate Function Pins and Port Types of Port CT
Note:
Alternate function not available on
μ
PD70F3447.
Caution:
On the
μ
PD70F31187, in single-chip mode 1 or in ROM-less mode, this port has exter-
nal control bus function only. Reprogramming of port CT to port mode is not possible
in these modes. Reading and writing of the port register PCT and port mode register
PMCT is possible but has no effect. Reading of the port mode control register PMCCT
is possible and the result is always 30H. Writing of the port mode control register
PMCCT is not possible.
(2)
Control registers
(a) Port register CT (PCT)
The PCT register is an 8-bit register that controls reading the pin levels and writing the output
levels of port pins PCT4 and PCT5.
This register can be read or written in 8-bit or 1-bit units.
Reset input causes an undefined register content.
Figure 20-73:
Port Register CT (PCT)
Remark:
n = 4, 5
Port
Alternate Function
Remark
Port Type
Port CT
PCT4
RD
Note
Read strobe signal output
Note
1
PCT5
WR
Note
Write strobe signal output
Note
After reset:
Undefined
R/W
Address:
FFFFF00AH
7
6
5
4
3
2
1
0
PCT
0
0
PCT5
PCT4
0
0
0
0
PCTn
Input/Output Data Control of Pin PCTn
0
Input mode: Low level is input
Output mode: Low level is output
1
Input mode: High level is input
Output mode: High level is output
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