HT49RV5 View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT49RV5

A/D With VFD Type 8-Bit MCU

Holtek Semiconductor 

HT49RV5/HT49CV5

Pin Name I/O Options

Description

PD0/PWM0

PD1/PWM1

Bidirectional 2-bit input/output port. Software instructions determine if the pin

I/O

Pull-high

PWM

is a CMOS output or Schmitt trigger input with or without a pull-high resistor

(determined by pull-high option: bit option). PD0~PD1 are pin-shared with

PWM0~PWM1 (dependent on Mask options).

PD4/INT0

PD5/INT1

PD6/TMR0

PD7/TMR1

Bidirectional 4-bit input/output port. Software instructions determine if the pin

is a CMOS output or Schmitt trigger input with or without a pull-high resistor

I/O Pull-high (determined by pull-high option: bit option). Pins PD4~PD7 are pin-shared

with INT0, INT1, TMR0 & TMR1, respectively (determined by software con-

trol).

VSS

¾

¾

Negative power supply, ground

VEE

¾

¾

VFD Negative power supply

SEG0~SEG10 O

¾

High voltage segment output for VFD panel.

SEG11/Grid10~

SEG15/Grid6

O

¾

High voltage output for VFD panel. These pins are selectable for segment or

grid output.

Grid0~Grid5

O

¾

High voltage grid output for VFD panel.

SDI

I

¾

Serial interface serial data input

SDO

O

¾

Serial interface serial data output

SCK

I/O

¾

Serial interface serial clock input/output (initial ²input²).

SCS

I/O

¾

Serial interface chip select pin, output for master mode, input for slave mode.

OSC4

OSC3

O

I

RTC or

System Clock

Real time clock oscillators. OSC3 and OSC4 are connected to a 32768Hz

crystal oscillator for timing purposes or to a system clock source (depending

on the options). No built-in capacitor.

VDD

¾

¾

Positive power supply

OSC2

OSC1

OSC1 and OSC2 are connected to an RC network or a crystal (by options) for

O

I

Crystal or RC

the internal system clock. For RC operation, OSC2 is an output pin for 1/4

system clock. The system clock may come from the RTC oscillator. If the sys-

tem clock comes from RTCOSC, these two pins can be left floating.

RES

I

¾

Schmitt trigger reset input, active low

Absolute Maximum Ratings

Supply Voltage ...........................VSS-0.3V to VSS+6.0V

Input Voltage..............................VSS-0.3V to VDD+0.3V

Storage Temperature ............................-50°C to 125°C

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. 1.20

4

April 14, 2006

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