Rev. 1.00

14

�ove��e� ��� �01�

Rev. 1.00

15

�ove��e� ��� �01�

HT66FU60A/HT66FU70A

Enhanced A/D Flash Type 8-Bit MCU with EEPROM and UART Interface

HT66FU60A/HT66FU70A

Enhanced A/D Flash Type 8-Bit MCU with EEPROM and UART Interface

Internally Connected Pins

Amongthepinsmentionedinthetablesaboveseveralpinsarenotconnectedtoexternalpackage

pins.ThesepinsareinterconnectionpinsbetweentheMCUandtheSPItoUARTchipsandare

listedinthefollowingtable.ThedescriptionisprovidedfromtheSPItoUARTchipstandpoint.

SPI-to-UART Chip

Pin Name

Type

Description

SDI

I

Slave SPI Se�ial Data In Input Signal

Inte�nally connected to the MCU Maste� SPI SDO output signal

SDO

O

Slave SPI Se�ial Data Out Output Signal

Inte�nally connected to the MCU Maste� SPI SDI input signal

SCK

I

Slave SPI Se�ial Clock Input Signal

Inte�nally connected to the MCU Maste� SPI SCK output signal

SCS

I

Slave SPI Device Select Input Signal

pull high �esisto�

CLKI

I

Clock Input Signal

Inte�nally connected to the MCU Maste� PCK output signal

I�T

O

UART Inte��upt Output Signal

Inte�nally connected to the MCU Maste� PI�T input signal

A UART �elated inte��upt will gene�ate a low pulse signal on this line