NEC PD703114 User Manual page 574

12.3.7 Port DL
Port DL is a 16-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/output in 1-bit units.
15 14
PDL PDL15 PDL14
7 6
PDL7 PDL6
Bit position Bit name
15 to 0 PDLn
(n = 15 to 0)
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
Port DL PDL15 to
PDL0
574
CHAPTER 12 PORT FUNCTIONS
13 12 11
PDL13 PDL12 PDL11
5 4 3
PDL5 PDL4 PDL3
I/O port
Alternate Pin Name
AD15 to AD0 Memory expansion address/data bus
User's Manual U15195EJ5V0UD
10 9 8
PDL10 PDL9 PDL8
2 1 0
PDL2 PDL1 PDL0
Function
Remarks
Address After reset
FFFFF005H Undefined
Address
FFFFF004H
Block Type
M