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HD404328 Datasheet, PDF (7/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER | |||
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HD404328 Series
Pin Description
Item
Power
supply
Test
Symbol
VCC
GND
TEST
Reset
RESET
Oscillator OSC1
Pin Number
DP-64S
DC-64S FP-64B
64
58
16
10
10
4
13
7
11
5
Port
OSC2
X1
X2
D0âD8
12
6
14
8
15
17â25
9
11â19
D9, D10
R00âR53
Interrupt
Serial
interface
INT0, INT1
SCK
SI
SO
Buzzer
LCD
BUZZ
V1, V2, V3
26, 27 20, 21
28â51 22â45
26, 27
32
20, 21
26
33
27
34
28
35
29
1â3
59â61
COM1âCOM4 60â63
SEG1âSEG24 36â59
54â57
30â53
FP-64A
56
8
2
5
3
4
6
7
9â17
18, 19
20â43
18, 19
24
25
26
27
57â59
52â55
28â51
I/O Function
Applies power voltage
Connected to ground
I
Used for factory testing only; connect
this pin to VCC
I
Resets the MCU
I
Input/output pins for the internal
oscillator circuit; connect them to a
crystal, ceramic, or external oscillator
circuit
O
I
Used for a 32.768-kHz crystal for
clock purposes; if not used, fix X1 to
VCC and leave X2 open
O
I/O Input/output ports addressed by
individual bits; pins D0âD7 are high-
current pins that can each supply up
to 15 mA
I
Input ports addressable by individual
bits
I/O Input/output ports addressable in 4-
bit units
I
Input pins for external interrupts
I/O Serial interface clock input/output pin
I
Serial interface receive data input pin
O Serial interface transmit data output
pin
O Buzzer signal output pin
Power pins for LCD driver; can be left
open in operation because they are
connected by internal voltage division
resistors (except for HD404324U,
HD404326U, HD404328U and
HD4074329U) Voltage conditions
are: VCC ⥠V1 ⥠V2 ⥠V3 ⥠GND
O Common signal pins for LCD
O Segment signal pins for LCD
5
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