Port 6 - NEC 78K0 User Manual

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.
The P60 to P63 pins are N-ch open-drain pins.
RESET input sets port 6 to input mode.
Figure 4-12 shows a block diagram of port 6.
RD
WR
PORT
WR
PM
PM6: Port mode register 6
RD: Read signal
WR××: Write signal
88
CHAPTER 4 PORT FUNCTIONS
Table 4-4. Pull-up Resistor of Port 6
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
Figure 4-12. Block Diagram of P60 to P63
Output latch
(P60 to P63)
PM6
PM60 to PM63
User's Manual U16227EJ2V0UD
Pins P60 to P63
Selector
EV
DD
Mask option resistor

Mask ROM versions only


No pull-up resistor for

flash memory versions

P60 to P63




