
HD404889/HD404899/HD404878/HD404868 Series
17
Pin Description
HD404889/HD404899/HD404878 Series
Pin Number
FP-80A
TFP-80C
16
12
9
Item
Power supply
Symbol
V
CC
GND
TEST
I/O
—
—
Input
Function
Apply the power supply voltage to this pin.
Connect to ground.
Not for use by the user application. Connect to GND
potential.
Used to reset the MCU.
Internal oscillator input/output pins. Connect a ceramic
resonator, crystal resonator, or external
oscillator circuit.
Test
Reset
Oscillation
RESET
OSC
1
15
10
Input
Input
OSC
2
X1
11
14
Output
Input
Realtime clock oscillator input/output pins. Connect a
32.768 kHz crystal. If 32.768 kHz
crystal oscillation is not used, fix the
×
1 pin to V
CC
and
leave the
×
2 pin open.
X2
13
Output
Port
D
0
–
D
11
17
–
28
I/O
I/O pins addressed bit by bit. D
0
to D
3
are large-current
source pins (max. 10 mA), and D
4
to D
11
are large-
current sink pins (max. 15 mA).
I/O pins, addressed in 4-bit units.
R0
0
–
R6
3
R7
0
–
R8
1
INT
0
,INT
1
WU
0
–
WU
3
29
–
56, 2
–
7
I/O
Interrupt
Wakeup
17,18
29
–
32
Input
Input
External interrupt input pins
Input pins used for transition from stop mode to active
mode.
Serial interface clock I/O pin
Serial interface receive data input pin
Serial interface transmit data output pin
Timer output pins
Event count input pins
LCD driver power supply pins. The on-chip power
supply dividing resistor can be disconnected by
software. Power supply conditions are:
V
CC
≥
V
1
≥
V
2
≥
V
3
≥
GND.
LCD common signal pins
LCD segment signal pins
A/D converter power supply pin. Connect as close as
possible to the V
CC
pin so as to be at the same potential
as V
CC
.
Ground pin for AV
. Connect as close as possible to
the GND pin so as to be at the same potential as GND.
A/D converter analog input pins
Timer overflow toggle output or divided system clock
output pin
Connect to ground potential.
Serial interface
SCK
SI
SO
TOB,TOC
EVNB,EVND
V
0
–
V
3
38
39
39
36,37
33,34
80
–
77
I/O
Input
Output
Output
Input
—
Timer
LCD
COM1
–
COM4
SEG1
–
SEG32
AV
CC
73
–
76
41
–
72
1
Output
Output
—
A/D converter
*
1
AV
SS
8
—
AN
0
–
AN
5
BUZZ
2
–
7
35
Input
Output
Buzzer output
Other
Notes: 1. Applies to HD404889 and HD404899 series.
2. Applies to HD404878 series.
NC
1, 8
*
2
—