HT68F20 datasheet(130/210 Pages) HOLTEK

130 / 210 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

Rev. 1.00

130

November 3, 2009

The SPI function in this device offers the following

features:

¨ Full duplex synchronous data transfer

¨ Both Master and Slave modes

¨ LSB first or MSB first data transmission modes

¨ Transmission complete flag

¨ Rising or falling active clock edge

¨ WCOL and CSEN bit enabled or disable select

The status of the SPI interface pins is determined by a

number of factors such as whether the device is in the

master or slave mode and upon the condition of certain

control bits such as CSEN and SIMEN.

There are several configuration options associated with

the SPI interface. One of these is to enable the SIM

function which selects the SIM pins rather than normal

I/O pins. Note that if the configuration option does not

select the SIM function then the SIMEN bit in the SIMC0

tion options determine if the CSEN and WCOL bits are

to be used.

SPI Registers

There are three internal registers which control the over-

all operation of the SPI interface. These are the SIMD

data register and two registers SIMC0 and SIMC2. Note

that the SIMC1 register is only used by the I

2C interface.

Name

Bit

76543210

SIMC0

SIM2

SIM1

SIM0

PCKEN

PCKP1

PCKP0

SIMEN

SIMD

SIMC2

CKPOLB

CKEG

MLS

CSEN

WCOL

TRF

SIM Registers List

The SIMD register is used to store the data being transmitted and received. The same register is used by both the SPI

and I

2C functions. Before the device writes data to the SPI bus, the actual data to be transmitted must be placed in the

SIMD register. After the data is received from the SPI bus, the device can read it from the SIMD register. Any transmis-

sion or reception of data from the SPI bus must be made via the SIMD register.

· SIMD Register

Bit

76543210

Name

R/W

POR

xxxxxxxx

²x² unknown

HT68F20 Datasheet(PDF) 130 Page - Holtek Semiconductor Inc

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