CHAPTER 2 PIN FUNCTIONS
User’s Manual U13850EJ4V0UM
57
(3/3)
Pin Name
I/O
PULL
Function
Alternate Function
SO1
P14/TXD0
SO2
P21
SO3
Serial transmit data output (3-wire type) for CSI0 to CSI3
P24/TXD1
SO4
Output
Yes
Serial transmit data output for variable-length CSI4 (3-wire type)
P33/TI11
TI00
Shared as external capture trigger input and external count
clock input for TM0
P30
TI01
External capture trigger input for TM0
P31
TI10
Shared as external capture trigger input and external count
clock input for TM1
P32/SI4
TI11
External capture trigger input for TM1
P33/SO4
TI2
External count clock input for TM2
P26/TO2
TI3
Input
Yes
External count clock input for TM3
P27/TO3
TI4
External count clock input for TM4
P36/TO4/A15
TI5
Input
Yes
External count clock input for TM5
P37/TO5
TO0, TO1
Pulse signal output for TM0, TM1
P34/A13/SCK4/P35/
A14
TO2
Pulse signal output for TM2
P26/TI2
TO3
Pulse signal output for TM3
P27/TI3
TO4
Pulse signal output for TM4
P36/TI4/A15
TO5
Output
Yes
Pulse signal output for TM5
P37/TI5
TXD0
P14/SO1
TXD1
Output
Yes
Serial transmit data output for UART0 and UART1
P24/SO3
UBEN
Output
No
Higher byte enable signal output for external data bus
P91
V
DD
−
−
Positive power supply pin
−
V
PP
−
−
High-voltage apply pin for program write/verify (
µ
PD70F303wA
and 70F303wAY only)
−
V
SS
−
−
GND potential
−
WAIT
Input
Yes
Control signal input for inserting wait in bus cycle
P110/A1
WRH
Higher byte write strobe signal output for external data bus
P92/R/W
WRL
Output
No
Lower byte write strobe signal output for external data bus
P90/LBEN
X1
Input
−
X2
−
No
Resonator connection for main clock
−
XT1
Input
−
XT2
−
No
Resonator connection for subsystem clock
−
Remark
PULL: On-chip pull-up resistor