CHAPTER 14 PORT FUNCTIONS
705
User’s Manual U14492EJ3V0UD
14.3.7 Port DL
Port DL is a 16-bit or 8-bit I/O port in which input or output can be specified in 1-bit units.
When using the higher 8 bits of PDL as PDLH and the lower 8 bits as PDLL, it can be used as an 8-bit I/O port that
can specify input or output in 1-bit units.
15
PDL15
PDL
14
PDL14
13
PDL13
12
PDL12
11
PDL11
10
PDL10
9
PDL9
8
PDL8
7
PDL7
6
PDL6
5
PDL5
4
PDL4
3
PDL3
2
PDL2
1
PDL1
0
PDL0
Address
FFFFF005H
Initial value
Undefined
Address
FFFFF004H
Bit Position
Bit Name
Function
15 to 0
PDLn
(n = 15 to 0)
I/O port
Besides functioning as a port, in control mode, this can operate as an address/data bus when memory is expanded
externally.
(1) Operation in control mode
Port
Alternate Pin Name
Remarks
Block Type
Port DL
PDL15 to
PDL0
AD15 to AD0
Memory expansion address/data bus
O
(2) Setting in I/O mode and control mode
Port DL is set in I/O mode using the port DL mode register (PMDL). In control mode, it is set using the port
DL mode control register (PMCDL).
Содержание V850E/IA1 mPD703116
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