HT66F20 datasheet(188/250 Pages) HOLTEK

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UART Module Pin Description

Pin Name

I/O

Description

External UART RX serial data input pin

If UARTEN=1 and RXEN=1, then RX is the UART serial data input

If UARTEN=0 or RXEN=0, then RX is high impedance

External UART TX serial data output pin

If UARTEN=1 and TXEN=1, then TX is the UART serial data output

If UARTEN=0 or TXEN=0, then TX is high impedance

SDI

Internal Slave SPI Serial Data In Input Signal

Internally connected to the MCU Master SPI SDO output signal

SDO

Internal Slave SPI Serial Data Out Output Signal

Internally connected to the MCU Master SPI SDI input signal

SCK

Internal Slave SPI Serial Clock Input Signal

Internally connected to the MCU Master SPI SCK output signal

SCS

Internal Slave SPI Device Select Input Signal

Internally connected to the MCU Master SPI SCS output signal -- connected to pull high

resistor

CLKI

Internal Clock Input Signal

Internally connected to the MCU Master PCK output signal

INT

Internal UART Interrupt Output Signal

Internally connected to the MCU Master PINT input signal

A UART related interrupt will generate a low pulse signal on this line

Implies that the pin is

²Not Connected² and can therefore not be used.

Notes: The pin description for all pins with the exception of the UART TX and RX pins are described in the preceding

MCU section.

UART Module D.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

IDD1

Operating Current *

(SPI Enabled, UART disabled)

3.0V

fCLKI=12MHz, SCK=fCLKI/4,

Output no load

¾¾

1.0

5.0V

fCLKI=16MHz, SCK=fCLKI/4,

Output no load

¾¾

2.0

IDD2

Operating Current *

(SPI enabled, UART enabled)

2.2V

fCLKI=6MHz, SCK=fCLKI/4,

Output no load

¾¾

4.2

5.0V

fCLKI=12MHz, SCK=fCLKI/4,

Output no load

¾¾

4.8

ISTB

Standby Current *

(SPI disabled, UART disabled)

5.0V

fCLKI=16MHz, SCK=fCLKI/4,

SCS=VDD, UARTEN=0,

TXEN=1, RXEN=1, SDI=H,

RX=H, Output no load

¾¾

0.6

VIL

Input Low Voltage for RX Ports

¾¾

0.3VDD

VIH

Input High Voltage for RX Ports

¾¾

0.7VDD

VDD

IOL

TX Port Sink Current

3.0V

VO=0.1VDD

2.5

5.0

5.0V

10.0

25.0

IOH

RX Port Source Current

3.0V

VO=0.9VDD

-1.5

-3.0

5.0V

-5.0

-8.0

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Rev. 1.20

188

June 4, 2010

HT66F20 Datasheet(PDF) 188 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 188 Page - Holtek Semiconductor Inc

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