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UPD78F4937 Datasheet(PDF) 11 Page - NEC

Part # UPD78F4937
Description  16-BIT SINGLE-CHIP MICROCONTROLLER
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD78F4937 Datasheet(HTML) 11 Page - NEC

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Preliminary Product Information
11
µµµµPD78F4937
4. LIST OF PIN FUNCTIONS
4.1
Port Pins (1/2)
Pin
I/O
Dual-function
Function
P00-P07
I/O
Port 0 (P0):
• 8-bit I/O port.
• Functions as a real-time output port (4 bits × 2).
• Inputs and outputs can be specified bit by bit.
• The use of pull-up resistors can be simultaneously specified by software
for all pins in input mode.
• Can drive a transistor.
P10
P11
P12
ASCK2/SCK2
P13
RxD2/SI2
P14
TxD2/SO2
P15-P17
I/O
Port 1 (P1):
• 8-bit I/O port.
• Inputs and outputs can be specified bit by bit.
• The use of pull-up resistors can be simultaneously specified by software
for all pins in input mode.
• Can drive LED.
P20
NMI
P21
INTP0
P22
INTP1
P23
INTP2/CI
P24
INTP3
P25
INTP4/ASCK/SCK1
P26
INTP5
P27
Input
SI0
Port 2 (P2):
• 8-bit input-only port.
• P20 does not function as a general-purpose port (nonmaskable interrupt).
However, the input level can be checked by an interrupt service routine.
• The use of pull-up resistors can be specified by software for pins P22 to
P27 (in units of 6 bits).
• The P25/INTP4/ASCK/SCK1 pin functions as the SCK1 I/O pin by CSIM1.
P30
RxD/SI1
P31
TxD/SO1
P32
SCK0
P33
SO0
P34-P37
I/O
TO0-TO3
Port 3 (P3):
• 8-bit I/O port.
• Inputs and outputs can be specified bit by bit.
• The use of pull-up resistors can be simultaneously specified by software
for all pins in input mode.
• P32 and P33 can be set as the N-ch open-drain pin.
P40-P47
I/O
AD0-AD7
Port 4 (P4):
• 8-bit I/O port.
• Inputs and outputs can be specified bit by bit.
• The use of pull-up resistors can be simultaneously specified by software
for all pins in input mode.
• Can drive LED.


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