UPD78F0411GA-GAM-AX Datasheet, PDF (96/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 4 PORT FUNCTIONS
4.2.9 Port 15
Port 15 is a 4-bit I/O port with an output latch. Port 15 can be set to the input mode or output mode in 1-bit units
using port mode register 15 (PM15). When the P150 to P153 pins are used as an input port, use of an on-chip pull-up
resistor can be specified in 1-bit units by pull-up resistor option register 15 (PU15).
This port can also be used for segment output.
Reset signal generation sets port 15 to input mode.
Figure 4-15 shows a block diagram of port 15.
WRPU
Figure 4-15. Block Diagram of P150 to P153
PU15
PU150 to PU153
VDD
P-ch
RD
WRPORT
WRPM
P15
Output latch
(P150 to P153)
PM15
PM150 to PM153
WRPF
LCD controller/driver
PFALL
PF15ALL
P15: Port register 15
PU15: Pull-up resistor option register 15
PM15: Port mode register 15
PFALL: Port function register ALL
RD: Read signal
WR××: Write signal
P150/SEG12 to
P153/SEG15
94
User’s Manual U18698EJ1V0UD