CAP1126 datasheet(19/73 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001623B-page 19

CAP1126

4.7

Bi-Directional SPI Protocols

4.7.1

RESET INTERFACE

Resets the Serial interface whenever two successive 7Ah codes are received. Regardless of the current phase of the

transaction - command or data, the receipt of the successive reset commands resets the Serial communication interface

only. All other functions are not affected by the reset operation.

4.7.2

SET ADDRESS POINTER

Sets the address pointer to the register to be accessed by a read or write command. This command overrides the auto-

incrementing of the address pointer.

FIGURE 4-8:

SPI Read Command - Normal Mode - Full

FIGURE 4-9:

SPI Reset Interface Command - Bi-directional Mode

Master SPDOUT

SPI_MOSI

Master Drives

Slave Drives

SPI_CLK

Read Command – 7Fh

SPI_CS#

Data at previously set register address = current

address pointer

SPI_MISO

‘0’

‘1’

Data at previously set register address = current

address pointer (SPI)

XXh

1. Register Read Address

updated to Current SPI Read

Address pointer

1. Register data loaded into

output buffer = data at current

address pointer

1. Output buffer transmitted =

data at previous address

pointer + 1 = current address

pointer

1. Register Read Address

incremented = current address

pointer + 1

1. SPI Read Address

Incremented = new current

address pointer

2. Register Read Address

Incremented = current address

pointer +1

Output buffer = data at current

address pointer + 1

1. Output buffer transmitted =

data at current address pointer

+ 1

2. Flag set to increment SPI

Read Address at end of next 8

clocks

‘0’

‘1’

Data at previously set register address = current

address pointer (SPI)

1. Register data loaded into

output buffer = data at current

address pointer

1. Output buffer transmitted =

data at previous register

address pointer + 1 = current

address pointer

1. Output buffer transmitted =

data at current address pointer

+ 1

2. Flag set to increment SPI

Read Address at end of next 8

clocks

Subsequent Read Commands – 7Fh

1. Register Read Address

updated to Current SPI Read

Address pointer.

2. Register Read Address

incremented = current address

pointer +1 – end result =

change

Master SPDOUT

SPI_MSIO

SPI_CS#

SPI_CLK

Reset - 7Ah

‘1’

‘0’

‘1’

‘0’

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