upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 76

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

4.2.5 Port 12
using port mode register 12 (PM12). When the P120 pin is used as an input port, use of an on-chip pull-up resistor
can be specified by pull-up resistor option register 12 (PU12).
76
Port 12 is a 1-bit I/O port with an output latch. Port 12 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.
RESET input sets port 12 to input mode.
Figure 4-12 shows a block diagram of port 12.
PU12:
PM12: Port mode register 12
RD:
WR××: Write signal
WR
WR
WR
RD
PORT
PM
PU
Pull-up resistor option register 12
Read signal
Output latch
Alternate
function
PU120
PM120
(P120)
PM12
PU12
Figure 4-12. Block Diagram of P120
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16846EJ3V0UD
V
DD
P-ch
P120/INTP0