EM77950 datasheet(78/102 Pages) EMC

78 / 102 page

EM77950

BB Controller

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Product Specification (V1.0) 10.09.2007

(This specification is subject to change without further notice)

9.6 Function Description

9.6.1 Block Diagram Description

The following subsections describe the function of each blocks and signals. Fig. 9.2

depicts how the SPI communication is carried out.

SDI:

Serial Data In

SCK:

Serial clock

SDO:

Serial Data Out

RBFIF:

Set by Buffer Full Detector, and reset by software

SPIS:

Loads the data in SPIWB register, and begin to shift

Shift reg.:

Shifting byte out and in. The order is defined by bit SDOD. Both the Shift

are written to, SPIS starts transmission / reception. The received data will be

moved to the SPIRB register, as the shifting of the 8-bit data is completed.

The RBFIF (Read Buffer Full) flag is equal to 1.

SPIRB:

Read buffer. The buffer will be updated, as the 8-bit shifting is completed. The

data must be read before the next reception is finished. The RBF flag is

cleared as the SPIRB register is read.

SPIWB:

Write buffer. The buffer will deny any write until the 8-bit shifting is completed.

The SPIS bit will be kept in 1 if the communication is still undergoing. This

flag must be cleared as the shifting is finished. Users can determine if the

next write attempt is available.

SBR2~SBR0:

Programming the clock frequency/rates and sources.

Edge Select:

Selecting the appropriate clock edges by programming the CES bit.

9.6.2 Signal & Pin Description

The three pins, SDI, SDO, and SCK, which are shown in Fig. 9-1, will be explained in

details as follows:

SDI:

SDI: Serial Data In

Serial Data In

Receive serially

Defined as high-impedance, if not selected.

EM77950 Datasheet(PDF) 78 Page - ELAN Microelectronics Corp

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