SWRA779 September   2023 CC3300 , CC3301 , CC3301MOD , CC3351MOD

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Main Features
    1. 2.1 Dual Host Interface
    2. 2.2 Shared Host Interface
    3. 2.3 Autonomous Mode
    4. 2.4 Host Interrupt
      1. 2.4.1 Out-of-Band Interrupt
      2. 2.4.2 In-Band Interrupt
  6. 3Interfaces
    1. 3.1 Introduction
    2. 3.2 SDIO Interface
      1. 3.2.1 SDIO Overview
      2. 3.2.2 SDIO Flow Control
    3. 3.3 SPI Interface
      1. 3.3.1 SPI Overview
      2. 3.3.2 SPI Configuration
      3. 3.3.3 SPI Flow Control
    4. 3.4 Uart Interface
      1. 3.4.1 UART Overview
      2. 3.4.2 UART Configuration
      3. 3.4.3 UART Flow Control
    5. 3.5 Pin Count Options
  7. 4Host Communication
    1. 4.1 Protocol Overview
    2. 4.2 SDIO Wrapper
    3. 4.3 SPI Wrapper
  8. 5Boot Flow
    1. 5.1 SDIO
    2. 5.2 SPI

3.3.1 SPI Overview

Table 3-7 lists the characteristics of the SPI host interface.

Table 3-3 SPI Interface Characteristics
Characteristics Description
Max frequency 25 MHz with optional 50 MHz in non-standard SPI mode(*)
Data bus 1-bit SPI
Max baud rate 26 Mbps (1 bit @25MHz). 52 Mbps for non-standard SPI 1
I/O voltage levels 1.8 V
  1. With non-standard SPI, the host processor doubles the supported clock frequency by both, sample and shift out, on rising edge of the clock.

Table 3-4 lists the signals of the SPI host interface.

Table 3-4 SPI Interface Signals
Signal Name Source Description
CLK Controller Serial bit clock
CS Controller Chip select
PICO (Peripheral In Controller Out) Controller Serial command and data input
POCI (Peripheral Out Controller In) Peripheral Serial busy and data output, high impedance when CS is high and during reset