CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U16315EJ1V0UD
97
4.2.9 Port 14
Port 14 is a 1-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 pin is used as an input port, use of an on-chip pull-up resistor
can be specified by pull-up resistor option register 14 (PU14).
This port can also be used for external interrupt request input and clock output.
RESET input sets port 14 to input mode.
Figure 4-18 shows a block diagram of port 14.
Figure 4-18. Block Diagram of P140
P140/PCL/INTP6
WR
PU
RD
WR
PORT
WR
PM
PU140
Alternate
function
Output latch
(P140)
PM140
Alternate
function
EV
DD
P-ch
Selector
Internal bus
PU14: Pull-up resistor option register 14
PM:
Port mode register
RD:
Port 14 read signal
WR:
Port 14 write signal