UPD78F0411GA-GAM-AX Datasheet, PDF (95/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 4 PORT FUNCTIONS
4.2.8 Port 14
Port 14 is a 4-bit I/O port with an output latch. Port 14 can be set to the input mode or output mode in 1-bit units
using port mode register 14 (PM14). When the P140 to P143 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 14 (PU14).
This port can also be used for segment output.
Reset signal generation sets port 14 to input mode.
Figure 4-14 shows a block diagram of port 14.
WRPU
Figure 4-14. Block Diagram of P140 to P143
PU14
PU140 to PU143
VDD
P-ch
RD
WRPORT
WRPM
P14
Output latch
(P140 to P143)
PM14
PM140 to PM143
WRPF
LCD controller/driver
PFALL
PF14ALL
P14: Port register 14
PU14: Pull-up resistor option register 14
PM14: Port mode register 14
PFALL: Port function register ALL
RD: Read signal
WR××: Write signal
P140/SEG8 to
P143/SEG11
User’s Manual U18698EJ1V0UD
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