HT45R35V
C/R to F Type 8-Bit OTP MCU
Technical Document
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Features
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Operating voltage:
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All instructions executed in one or two instruction
f
SYS
=4MHz: 2.2V~5.5V
f
SYS
=8MHz: 3.3V~5.5V
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16 bidirectional I/O lines
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Two external interrupt inputs shared with I/O lines
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8-bit programmable timer/event counter with
cycles
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14-bit table read instruction
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Four-level subroutine nesting
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Bit manipulation instruction
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63 powerful instructions
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Low voltage reset function
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Integrated DC 24V to 5V LDO regulator
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Buzzer and filament 5V to 24V output level shifter
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24-bit shift register/latch for VFD panel driving 24
overflow interrupt and 7-stage prescaler
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External RC oscillation converter
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On-chip crystal and RC oscillator
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Watchdog Timer
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12 capacitor/resistor sensor input
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2048´14 program memory
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120´8 data memory RAM
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Power Down and Wake-up function reduce power
grid/segment outputs
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Integrated 3-line serial VFD interface for
grid/segment display control
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52-pin QFP package type
consumption
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Up to 0.5ms instruction cycle with 8MHz system clock
at V
DD
=5V
General Description
The HT45R35V is a C/R to F Type with 8-bit high perfor-
mance RISC architecture microcontroller designed es-
pecially for VFD applications.
The usual Holtek MCU features such as power down
and wake-up functions, oscillator options, etc. combine
to ensure user applications require a minimum of exter-
nal components.
The device is specifically designed for VFD applications
that interface directly to VFD panels. The benefits of in-
tegrated C/R to F functions, in addition to low power
consumption, high performance, I/O flexibility and
low-cost, enhance the versatility of these devices to suit
a wide range of VFD application possibilities such as
household appliance timers, various consumer prod-
ucts, subsystem controllers, other home appliances etc.
Rev. 1.00
1
March 19, 2009
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
