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User’s Manual U12697EJ4V1UD
CHAPTER 2
PIN FUNCTIONS
(2) Non-port pins (2/2)
Pin Name
I/O
Alternate Function
Function
PCL
Output
P23
Clock output (for main system clock, subsystem clock trimming)
BUZ
P24
Buzzer output
RTP0 to RTP7
P120 to P127
Real-time output port that outputs data synchronized with the trigger
AD0 to AD7
I/O
P40 to P47
Lower address/data bus when the memory is externally expanded
A8 to A15
Output
P50 to P57
Middle address bus when the memory is externally expanded
A16 to A19
P60 to P63
Higher address bus when the memory is externally expanded
RD
P64
Strobe signal output for external memory read
WR
P65
Strobe signal output for external memory write
WAIT
Input
P66
Wait insertion during external memory access
ASTB
Output
P67
Strobe output that externally latches the address information that is
output to ports 4 to 6 in order to access external memory
EXA
P37
External access status output
RESET
Input
—
System reset input
X1
—
Crystal connection for main system clock oscillation
X2
—
XT1
Input
—
Crystal connection for subsystem clock oscillation
XT2
—
ANI0 to ANI7
Input
P10 to P17
Analog voltage input for A/D converter
ANO0, ANO1
Output
P130, P131
Analog voltage output for D/A converter
AVREF1
—
Reference voltage applied for D/A converter
AVDD
Positive power supply for A/D converter. Connect to VDD0.
AVSS
Ground for A/D converter and D/A converter. Connect to VSS0.
VDD0
Positive power supply for ports
VSS0
Ground potential for ports
VDD1
Positive power supply (excluding ports)
VSS1
Ground potential (excluding ports)
TEST
VPPNote
Connect directly to VSS0 or pull down (IC test pin). For the pull-down
connection, use of a resistor with a resistance between 470
and 10
k
is recommended.
VPPNote
TEST
Flash memory programming mode setting
High voltage application pin during program write/verify
Connect via a pull-down resistor in flash memory programming mode.
For the pull-down connection, use of a resistor with a resistance
between 470
and 10 k is recommended.
Note The VPP pin is provided only in the
PD78F4225 and 78F4225Y.