
166
Chapter 4
Port Functions
User’s Manual U16702EE3V2UD00
4.3.13 Port
DL
Port DL is a 14-bit port for which I/O settings can be controlled in 1-bit units.
(1)
Port DL functions
•
14-bit I/O port
•
Port input/output specifiable in 1-bit units by port mode register DL (PMDL)
•
Port mode/control mode specifiable in 1-bit units by port mode control register DL (PMCDL)
See
Table 4-8, “Port Type,” on page 170
for alternate functions.
(2)
Registers
(a) Port register DL (PDL)
Port register DL (PDL) is a 16-bit register used to control pin level read and output level write.
This register can be read and written in 8-bit and 1-bit units.
However, when using the higher 8 bits of the PDL register as the PDLH register and the lower
8 bits as the PDLL register, PDL becomes two 8-bit registers for which I/O can be manipulated in
8-bit or 1-bit units.
Figure 4-66:
Port Register DL (PDL) Format
Remarks: 1.
Input mode:
When port DL (PDL) is read, the pin levels at this time are read. During
write, the data written to PDL is written. This does not affect the input
pins.
Output mode:
When port DL (PDL) is read, the value of PDL is read. During write, the
value is written to PDL and the written value is immediately output.
2.
An undefined value (pin input level) is read for the value after reset when PDL is read in
the input mode. When PDL is read in the output mode, 00H (output latch value) is out-
put.
Symbol
15
14
13
12
11
10
9
8
Address
After reset
PDLH
0
0
PDL13
PDL12
PDL11
PDL10
PDL9
PDL8
FFFFF005H undefined
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Symbol
7
6
5
4
3
2
1
0
Address
After reset
PDLL
PDL7
PDL6
PDL5
PDL4
PDL3
PDL2
PDL1
PDL0
FFFFF004H undefined
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PDLn
Output data control (in output mode) (n = 0 to 13)
0
Outputs 0
1
Outputs 1
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