http://s653.photobucket.com/albums/uu259/rockc4/FanLED/?action=view&current=mat_1-Copy.png

sS

1. SPI INTERFACE

2. REGISTERS

3. 74HC595

4. SAMPLE CODE

USCI Serial Protocols

• SPI • Serial Peripheral Interface

• Single Master/Single Slave

SPI Master

SPI Slave

SCLK

MOSI

MISO

I2C • Inter-Integrated Circuit Interface

• Single Master/Multiple Slaves C Master

DAC Slave

ADC Slave

C Slave

R R

SCL SDA

Vdd

UART • Universal Asynchronous

Receiver/Transmitter

• Full duplex

R/T R/T

Tx Rx

Rx Tx

52

P1.5 P1.6 P1.7

𝑆𝑆

1 2 3 4

USI BLOCK DIAGRAM : SPI MODE

P1.5

P1.6

P1.4

USICNT REGISTER

USICTL0: USI CONTROL REGISTER 0

USICTL1: USI CONTROL REGISTER 1

USICKCLT: USI CLOCK CONTROL REGISTER