UPD784938 Datasheet, PDF (51/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 2 PIN FUNCTIONS
2.1 Pin Function Lists
2.1.1 Normal operation mode
(1) Port pins (1/2)
Pin Name
P00 to P07
P10
P11
P12
P13
P14
P15 to P17
P20
P21
P22
P23
P24
P25
P26
P27
P30
P31
P32
P33
P34 to P37
Input/Output
Input/output
Input/output
Input
Input/output
Alternate Function
—
—
—
ASCK2/SCK2
RxD2/SI2
TxD2/SO2
—
NMI
INTP0
INTP1
INTP2/CI
INTP3
INTP4/ASCK/SCK1
INTP5
SI0
RxD/SI1
TxD/SO1
SCK0
SO0
TO0 to TO3
Function
Port 0 (P0):
• 8-bit input/output port
• Can be used as real-time output ports (4 bits × 2)
• Input/output can be specified in 1-bit units
• For input mode pins, on-chip pull-up resistor connection can be
specified at once by means of software
• Transistor drive capability
Port 1 (P1):
• 8-bit input/output port
• Input/output can be specified in 1-bit units
• For input mode pins, on-chip pull-up resistor connection can be
specified at once by means of software
• LED drive capability
Port 2 (P2):
• 8-bit input/output port
• P20 cannot be used as a general-purpose port (non-maskable
interrupt). Input level can be confirmed in the interrupt routine.
• For P22 to P27, on-chip pull-up resistor connection can be specified
by means of software in 6-bit units
• The P25/INTP4/ASCK/SCK1 pin operates as the SCK1 output pin
in accordance with the CSIM1 register specification
Port 3 (P3):
• 8-bit input/output port
• Input/output can be specified in 1-bit units
• For input mode pins, on-chip pull-up resistor connection can be
specified at once by means of software
• P32 and P33 can be set in N-ch open-drain mode
Preliminary User’s Manual U13987EJ1V0UM00
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