upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 56

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

4.2.2
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.
is the reset function. For the setting method for pin functions, see CHAPTER 15 OPTION BYTE.
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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
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
When P34 is used as an input port pin, connect the pull-up resistor.
Figures 4-5 and 4-6 show the block diagrams of port 3.
Port 3
P3:
PU3:
PM3:
RD:
WR××: Write signal
WR
WR
WR
RD
PORT
PM
PU
Port register 3
Pull-up resistor option register 3
Port mode register 3
Read signal
Output latch
Alternate
function
PM32
PU32
(P32)
PU3
PM3
P3
Figure 4-5. Block Diagram of P32
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16994EJ3V0UD
V
DD
P-ch
P32/INTP1