HT47R20A-1/HT47C20-1
R-F Type 8-Bit MCU
Technical Document
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Features
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Operating voltage: 2.2V~5.5V
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Eight bidirectional I/O lines
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Four input lines
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One interrupt input
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One 16-bit programmable timer/event counter with
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One low voltage reset circuit
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One buzzer output
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HALT function and wake-up feature reduce power
consumption
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LCD bias C type or R type
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One LCD driver with 20´2, 20´3 or 19´4 segments
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One IR carrier output
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Two channels RC type A/D converter
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Four-level subroutine nesting
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Bit manipulation instruction
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16-bit table read instruction
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Up to 1ms instruction cycle with 4MHz system clock
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All instructions in one or two machine cycles
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63 powerful instructions
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64-pin QFP package
PFD (programmable frequency divider) function
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On-chip crystal and RC oscillator for system clock
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One 32.768kHz crystal oscillator for real time clock or
system clock
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Watchdog Timer
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2K´16 program memory
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64´8 data memory RAM
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One Real Time Clock (RTC)
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One 8-bit prescaler for RTC
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One low voltage detector
General Description
The HT47R20A-1/HT47C20-1 are 8-bit, high perfor-
mance, RISC architecture microcontroller devices spe-
cifically designed for applications that interface directly
to analog signals, such as those from sensors. The
mask version HT47C20-1 is fully pin and functionally
compatible with the OTP version HT47R20A-1 device.
The advantages of low power consumption, I/O flexibil-
ity, programmable frequency divider, timer functions,
oscillator options, 2-channel RC type A/D Converter,
LCD driver, HALT and wake-up functions, enhance the
versatility of these devices to suit a wide range of Resis-
tor to Frequency application possibilities such as sensor
signal processing, remote metering, industrial control,
consumer products, subsystem controllers, etc.
Rev. 1.70
1
June 14, 2005
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
