HT85F2270 datasheet(192/226 Pages) HOLTEK

192 / 226 page

Rev. 1.00

19� of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

SPI Registers

There are three internal registers which control the overall operation of the SPI interface. These

are the SPDAT data register, where the received data or transmitted data is stored and two control

registers SPCON and SPSTA.

SPI Register List

Name

Bit

SPCON

SPR�

SPEN

SSDIS

�STR

CPOL

CPHA

SPR1

SPR0

SPSTA

SPIF

WCOL

SSERR

�ODF

—

SPDAT

D�

The SPDAT register is used to store the data being transmitted and received. Before the device

writes data to the SPI bus, the actual data to be transmitted must be placed in the SPDAT register.

After the data is received from the SPI bus, the device can read the data from the SPDAT register.

Any transmission or reception of data from the SPI bus must be made via the SPDAT register.

SPDAT Register

SFR Address: E3h

Bit

Name

D�

R/W

POR

There are also two control registers for the SPI interface, SPCON and SPSTA. Register SPCON

is used to control the enable/disable function, to assign the clock Polarity/Edge types, to

enable/disable the SPI function and to set the data transmission clock frequency. Register SPSTA

is used to indicate the SPI operational status, such as data transferred complete flag, write collision

flag, Synchronous Serial Slave Error flag and SPI mode Fault detection flag etc. When any one of

the SPIF, WCOL, SSERR and MODF flags in the SPSTA register is set high, an SPI interrupt will

occur if the SPI interrupt function is enabled.

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