HT67F60 datasheet(162/242 Pages) HOLTEK

162 / 242 page

Rev. 1.50

162

March 06 , 2012

Rev. 1.50

163

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

Serial Interface Module – SIM

These devices contain a Serial Interface Module, which includes both the four line SPI interface or

the two line I2C interface types, to allow an easy method of communication with external peripheral

hardware. Having relatively simple communication protocols, these serial interface types allow the

microcontroller to interface to external SPI or I2C based hardware such as sensors, Flash or

EEPROM memory, etc. The SIM interface pins are pin-shared with other I/O pins therefore the SIM

interface function must first be selected using a configuration option. As both interface types share

the same pins and registers, the choice of whether the SPI or I2C type is used is made using the SIM

operating mode control bits, named SIM2~SIM0, in the SIMC0 register. These pull-high resistors of

the SIM pin-shared I/O are selected using pull-high control registers, and also if the SIM function is

enabled.

SPI Interface

This SPI interface function which is contained within the Serial Interface Module, should not be

confused with the other independent SPI function, known as SPIA, which is described in another

section of this datasheet. The SPI interface is often used to communicate with external peripheral

devices such as sensors, Flash or EEPROM memory devices etc. Originally developed by Motorola,

the four line SPI interface is a synchronous serial data interface that has a relatively simple

communication protocol simplifying the programming requirements when communicating with

external hardware devices.

The communication is full duplex and operates as a slave/master type, where the device can be

either master or slave. Although the SPI interface specification can control multiple slave devices

from a single master, but this device provided only one SCS pin. If the master needs to control

multiple slave devices from a single master, the master can use I/O pin to select the slave devices.

SPI Interface Operation

● The SPI interface is a full duplex synchronous serial data link. It is a four line interface with pin

names SDI, SDO, SCK and SCS. Pins SDI and SDO are the Serial Data Input and Serial Data

Output lines, SCK is the Serial Clock line and SCS is the Slave Select line. As the SPI interface

pins are pin-shared with normal I/O pins and with the I2C function pins, the SPI interface must

first be enabled by selecting the SIM enable configuration option and setting the correct bits in the

SIMC0 and SIMC2 registers. After the SPI configuration option has been configured it can also

be additionally disabled or enabled using the SIMEN bit in the SIMC0 register. Communication

between devices connected to the SPI interface is carried out in a slave/master mode with all data

transfer initiations being implemented by the master. The Master also controls the clock signal.

As the device only contains a single SCS pin only one slave device can be utilized. The SCS pin

is controlled by software, set CSEN bit to "1" to enable SCS pin function, set CSEN bit to "0" the

SCS pin will be floating state.

SP I M ast er

SP I Sl av e

SC K

SD O

SD I

SC S

SC K

SD I

SD O

SC S

SPI Master/Slave Connection

HT67F60 Datasheet(PDF) 162 Page - Holtek Semiconductor Inc

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