UPD78F9500MA-CAC-A Datasheet, PDF (66/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 4 PORT FUNCTIONS
4.2.2 Port 3
The P32 pin is a 1-bit I/O port with an output latch. This pin can be set to the input or output mode by using port
mode register 3 (PM3). When this pin is used as an input port, an on-chip pull-up resistor can be connected in 1-bit
units by using pull-up resistor option register 3 (PU3). This pin can also be used for external interrupt request input.
The P32 pin is a Reset signal generation sets port 3 to the input mode.
The P34 pin is a 1-bit input-only port. This pin is also used as a RESET pin, and when the power is turned on, this
is the reset function. For the setting method for pin functions, see CHAPTER 15 OPTION BYTE.
When P34 in μPD78F920x is used as an input port pin, connect the pull-up resistor.
<R> _{When P34 in μPD78F950x is used as an input port pin, an on-chip pull-up resistor can be connected in 1-bit units}
by using pull-up resistor option register 3 (PU3).
Figures 4-8 and 4-10 show the block diagrams of port 3.
WRPU
RD
Figure 4-8. Block Diagram of P32
PU3
PU32
Alternate
function
VDD
P-ch
WRPORT
WRPM
P3
Output latch
(P32)
PM3
PM32
P3: Port register 3
PU3: Pull-up resistor option register 3
PM3: Port mode register 3
RD: Read signal
WR××: Write signal
P32/INTP1
64
User’s Manual U18172EJ3V0UD