HT45F43 datasheet(82/152 Pages) HOLTEK

82 / 152 page

Serial Interface Module

- SIM

This device contains a Serial Interface Module, which includes both the four line SPI interface or the

two line I

2C 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 I

2C 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 I

2C 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

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 I

2C 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

²1² to enable

SCS pin function, set CSEN bit to

²0² the SCS pin will be floating state.

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

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

S P I M a s t e r

S P I S l a v e

S C K

S D O

S D I

S C S

S C K

S D I

S D O

S C S

SPI Master/Slave Connection

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