HT47C20
8-Bit R-F Type Mask MCU
Features
·
Operating voltage: 2.4V~3.6V
·
Eight bidirectional I/O lines
·
Four input lines
·
One interrupt input
·
One 16-bit programmable timer/event counter with
·
HALT function and wake-up feature reduce power
consumption
·
LCD bias C type
·
One LCD driver with 20
´
3 or 19
´
4 segments
·
One 38kHz or 40kHz IR carrier output
PFD (programmable frequency divider) function
·
On-chip crystal and RC oscillator for system clock
·
One 32.768kHz crystal oscillator for real time clock
·
Watchdog Timer
·
2K´16 program memory ROM
·
64´8 data memory RAM
·
One Real Time Clock (RTC)
·
One 8-bit prescaler for RTC
·
One buzzer output
(455kHz or 480kHz system clock only)
·
Two channels RC type A/D converter
·
Four-level subroutine nesting
·
Bit manipulation instruction
·
16-bit table read instruction
·
Up to 8.3ms instruction cycle with 480kHz system
clock
·
All instructions in one or two machine cycles
·
63 powerful instructions
·
64-pin QFP package
General Description
The HT47C20 is an 8-bit high performance RISC-like
microcontroller. Its single cycle instruction and
two-stage pipeline architecture make high speed appli-
cations. The device is suited for use in multiple LCD low
power applications among which are calculators, clock
timers, games, scales, toys, thermometers, hygrometers,
body thermometers, capacitor scaler, other hand held
LCD products, and battery systems in particular.
Rev. 1.60
1
July 26, 2002
HT47C20
Pad Description
Pad No.
1
Pad Name
RES
I/O
I
Mask
Option
¾
Function
Schmitt trigger reset input. Active low.
2
3
4
5
6~9
PA0/BZ
PA1/BZ
PA2/IR
PA3/PFD
PA4~PA7
I/O
Bidirectional 8-bit input/output port. The low nibble of the PA can be
configured as CMOS output or NMOS output with or without
Wake-up pull-high resistors (mask option). NMOS output can be configured
Pull-high as Schmitt trigger input with or without pull-high resistors. Each bit of
or None NMOS output can be configured as wake up input by mask option.
CMOS or 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
NMOS
also by mask option. PA3 can be set as an I/O pin or a PFD output
also by mask option.
Four-bit Schmitt trigger input port. The PB is configured as with
pull-high resistors. Of the four bits, PB0 can be set as an input pin or
an external interrupt input 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, ground
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 measurement of chan-
nel 0
Resistor sensor connection pin for measurement of channel 0
10
11
12
13
14
18
17
16
15
23
22
21
20
19
27
26~24
28~46
PB0/INT
PB1
PB2/TMR
PB3
VSS
IN1
CS1
RS1
RT1
IN0
CS0
RS0
CRT0
RT0
SEG19/COM3
COM2~COM0
SEG18~SEG0
I
¾
¾
I
O
O
O
I
O
O
O
O
O
O
¾
O
I
¾
O
I
¾
¾
¾
SEG19/COM3 can be set as a segment or a common output driver
1/3 or 1/4
for LCD panel by mask option. COM2~COM0 are outputs for LCD
Duty
panel plate.
¾
¾
¾
¾
LCD driver outputs for LCD panel segments
Voltage pump
Real time clock oscillators
Positive power supply
49, 48, 47 V1, V2, V3
51, 50
C1, C2
52
53
54
55
56
OSC4
OSC3
VDD
OSC2
OSC1
Crystal or OSC1 and OSC2 are connected to an RC network or a crystal
RC
(by mask option) for the internal system clock.
Absolute Maximum Ratings
Supply Voltage .........................................-0.3V to 5.5V
Storage Temperature ............................-50°C to 125°C
Input Voltage..............................V
SS
-0.3V
to V
DD
+0.3V
Operating Temperature...........................-40°C to 85°C
Note: These are stress ratings only. Stresses exceeding the range specified under
²Absolute
Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Rev. 1.60
5
July 26, 2002
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