upd78f0134hgka1-9et-a Renesas Electronics Corporation., upd78f0134hgka1-9et-a Datasheet - Page 104

• Manufacturer Part Number: upd78f0134hgka1-9et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

4.2.11 Port 14
using port mode register 14 (PM14). When the P140 and P141 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).
104
Port 14 is a 2-bit I/O port with an output latch. Port 14 can be set to the input mode or output mode in 1-bit units
This port can also be used for external interrupt request input, buzzer output, and clock output.
RESET input sets port 14 to input mode.
Figure 4-20 shows a block diagram of port 14.
WR
WR
WR
PU14:
PM14:
RD:
WR
RD
PORT
PU
PM
: Write signal
Pull-up resistor option register 14
Port mode register 14
Read signal
PM140, PM141
PU140, PU141
(P140, P141)
Output latch
Alternate
Alternate
function
function
PM14
PU14
Figure 4-20. Block Diagram of P140 and P141
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16899EJ3V0UD
EV
DD
P-ch
P140/PCL/INTP6,
P141/BUZ/INTP7