HT49CV7 datasheet(4/48 Pages) HOLTEK

4 / 48 page

Pin Name

I/O

Options

Description

PD4/INT0

PD5/INT1

PD6/TMR0

PD7/TMR1

I/O

Pull-high

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

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

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

trol).

RMT

Pull-high

RMT with wake-up function (both rising and falling edge) and Schmitt trigger

input with or without a pull-high resistor (determined by pull-high option).

VSS

¾¾

Negative power supply, ground

VEE

¾¾

VFD Negative power supply

SEG0~SETG10

High-voltage segment output for VFD panel.

SEG11/Grid10~

SEG15/Grid6

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

grid output.

Grid0~Grid5

High-voltage grid output for VFD panel.

SDI

Serial interface serial data input

SDO

Serial interface serial data output

SCK

I/O

Serial interface serial clock input/output (initial

²input²).

SCS

I/O

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

OSC4

OSC3

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

¾¾

Positive power supply

OSC2

OSC1

Crystal or RC

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

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 system clock co-

mes from RTCOSC, these two pins can be left floating.

RES

Schmitt trigger reset input, active low

Absolute Maximum Ratings

Supply Voltage ...........................VSS

-0.3V to VSS+6.0V

Storage Temperature ............................

-50°Cto125°C

Input Voltage..............................VSS

-0.3V to VDD+0.3V

Operating Temperature...........................

-40°Cto85°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.

HT49RV7/HT49CV7

Rev. 1.00

April 20, 2006

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