HT47C20 Holtek Semiconductor Inc, HT47C20 Datasheet - Page 5

• Manufacturer Part Number: HT47C20
• Description: 8-Bit Microcontroller
• Manufacturer: Holtek Semiconductor Inc

Pad Description
1
2
3
4
5
6~9
10
11
12
13
14
18
17
16
15
23
22
21
20
19
27
26~24
28~46
49, 48, 47
51, 50
52
53
Pad No.
RES
PA0/BZ
PA1/BZ
PA2/IR
PA3/PFD
PA4~PA7
PB0/INT
PB1
PB2/TMR
PB3
VSS
IN1
CS1
RS1
RT1
IN0
CS0
RS0
CRT0
RT0
SEG19/COM3
COM2~COM0
SEG18~SEG0
V1, V2, V3
C1, C2
OSC4
OSC3
Pad Name
I/O
I/O
¾
¾
O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
Pull-high
CMOS or
1/3 or 1/4
Wake-up
Option
or None
NMOS
Mask
Duty
¾
¾
¾
¾
¾
¾
¾
¾
Schmitt trigger reset input. Active low.
of the PA can be configured as CMOS output or
NMOS output with or without pull-high resistors
(mask option). NMOS output can be configured as
schmitt trigger input with or without pull-high resis-
tors. Each bit of NMOS output can be configured as
wake up input by mask option. Of the eight bits,
PA0~PA1 can be set as I/O pins or buzzer outputs by
mask option. PA2 can be set as an I/O pin or an IR
carrier output also by mask option. PA3 can be set as
an I/O pin or a PFD output also by mask option.
ured as with pull-high resistors. Of the four bits, PB0
can be set as an input pin or an external interrupt in-
put pin (INT) by software application. While PB2 can
be set as an input pin or a timer/event counter input
pin also by software application.
Negative power supply, GND
Oscillation input pin of channel 1
Reference capacitor connection pin of channel 1
Reference resistor connection pin of channel 1
Resistor sensor connection pin for measurement of
channel 1
Oscillation input pin of channel 0
Reference capacitor connection pin of channel 0
Reference resistor connection pin of channel 0
Resistor/capacitor sensor connection pin for mea-
surement of channel 0
Resistor sensor connection pin for measurement of
channel 0
SEG19/COM3 can be set as a segment or a common
output driver for LCD panel by mask option.
COM2~COM0 are outputs for LCD panel plate.
Voltage pump
Real time clock oscillators
Bidirectional 8-bit input/output port. The low nibble
Four-bit Schmitt trigger input port. The PB is config-
LCD driver outputs for LCD panel segments
5
Function
January 18, 2000
HT47C20