AT89C5122DS-RDRUM datasheet(141/208 Pages) ATMEL

Part #	AT89C5122DS-RDRUM

Description	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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141 / 208 page

141

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Mode Fault flag, MODF: This bit becomes set to indicate that the level on the SS is

inconsistent with the mode of the SPI. MODF with SSDIS reset, generates receiver/error

CPU interrupt requests.

Figure 88 gives a logical view of the above statements.

Figure 88.

SPI Interrupt Requests Generation

Registers

There are three registers in the module that provide control, status and data storage

functions. These registers are described in the following paragraphs.

Serial Peripheral Control

The Serial Peripheral Control Register does the following:

•

Selects one of the Master clock rates

•

Configures the SPI module as Master or Slave

•

Selects serial clock polarity and phase

•

Enables the SPI module

•

Frees the SS pin for a general-purpose

SSDIS

MODF

CPU Interrupt Request

SPI Receiver/error

CPU Interrupt Request

SPI Transmitter

SPI

CPU Interrupt Request

SPIF

AT89C5122DS-RDRUM Datasheet(PDF) 141 Page - ATMEL Corporation