Holtek HT48R065V 24V VFD MCU方案

Holtek 公司的HT48R065V 是24V VFD 型8位OTP MCU, 可直接驱动12~24V的VFD(真空荧光显示屏) , 內建5V LDO輸出,可將輸入的12~24V高压转换為5V电压供給MCU Core及外部5V元件,並內建高压Buzzer 驱动器与灯絲(Filament)高压輸出,可大幅精簡VFD應用的顯示驅動、電源處理等電路設計. 目标应用为家電、音響、DVD 播放器、STB及汽車等.本文介绍HT48R065V主要特性,方框图, 系统时钟配置框图,各种I/O端口图和典型应用电路图.

HT48R065V 24V VFD Type 8-Bit OTP MCU

The 48R065V is a 24V VFD Type 8-bit high performance, RISC architecture microcontrollers specifically designed for a wide range of applications. The usual Holtek microcontroller features of low power consumption, I/O flexibility, timer functions, oscillator options, power down and wake-up functions, watchdog timer and low voltage reset, combine to provide devices with a huge range of functional options while still maintaining a high level of cost effectiveness. The fully integrated system oscillator HIRC, which requires no external components and which has three frequency selections, opens up a huge range of new application possibilities for these devices, some of which may include industrial control, consumer products, household appliances subsystem controllers, etc.

HT48R065V 主要特性:

CPU Features

Operating voltage:

fSYS= 4MHz: 2.2V~5.5V

fSYS= 8MHz: 3.0V~5.5V

fSYS= 12MHz: 4.5V~5.5V

Up to 0.33 s instruction cycle with 12MHz system clock at VDD= 5V

Sleep mode and wake-up functions to reduce power consumption

Oscillator types:

External high freuency Crystal -- HXT

External RC – ERC

Internal high frequency RC -- HIRC

External low frequency crystal -- LXT

Four operational modes: Normal, Slow, Sleep

Fully integrated internal 4MHz, 8MHz and 12MHz oscillator requires no external components

2048 15 program memory

96 8 data memory RAM

Watchdog Timer function

LIRC oscillator function for watchdog timer

All instructions executed in one or two instruction cycles

Table read instructions

63 powerful instructions

4-level subroutine nesting

Bit manipulation instruction

Low voltage reset function

Wide range of available package types

Peripheral Features

21 bidirectional I/O lines

Software controlled 4-SCOM lines LCD COM driver with 1/2 bias

External interrupt input shared with an I/O line

Single 8-bit programmable Timer/Event Counter with overflow interrupt and prescaler

Time-Base function

Programmable Frequency Divider - PFD

Integrated DC 24V to 5V LDO regulator

Buzzer and filament 5V to 24V output level shifter

24-bit shift register/latch for VFD panel driving 24 grid/segment outputs

Integrated 3-line serial VFD interface for grid/segment display control

52-pin QFP package


图1.HT48R065V方框图

图2.HT48R065V系统时钟配置框图

图3.HT48R065V GPIO端口图

图4.HT48R065V PA7 NMOS I/O端口图

图5.HT48R065V PB I/O端口图

图6.HT48R065V 应用电路图