CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U16315EJ1V0UD
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4.2.5 Port 6
Port 6 is a 4-bit I/O port with an output latch. Port 6 can be set to the input mode or output mode in 1-bit units
using port mode register 6 (PM6).
This port has the following functions for pull-up resistors. These functions differ depending on whether the product
is a mask ROM version or a flash memory version.
Table 4-3. Pull-up Resistor of Port 6
Pins P60 to P63
Mask ROM version
An on-chip pull-up resistor can be
specified in 1-bit units by mask option
Flash memory version
On-chip pull-up resistors are not provided
RESET input sets port 6 to input mode.
Figure 4-14 shows a block diagram of port 6.
Figure 4-14. Block Diagram of P60 to P63
RD
P60 to P63
WR
PORT
WR
PM
Output latch
(P60 to P63)
PM60 to PM63
Selector
EV
DD
Mask option resistor
Internal bus
Mask ROM versions only
No pull-up resistor for
flash memory versions
PM:
Port mode register
RD:
Port 6 read signal
WR:
Port 6 write signal