L9966 datasheet(55/122 Pages) STMICROELECTRONICS

55 / 122 page

Bit

Function/Meaning

TRANS_F = 1: previous transfer was recognized as not valid (only if chip address is recognized)

[23:16] Blind address echo

[15] PAR_MISO_DATA

Odd parity bit of data computed over [15:0]

‘1’ in case of wrong instruction code detected

[14:0] read data or

previous content of register in case of write access

'7FFFhex' in case of wrong instruction code detected

13.5

Burst mode

The burst mode has the advantage to transfer more data in less time: only one 16 bits instruction has to be sent

during the transfer. As long as the CS is low and a clock is provided, data can be transferred. The burst mode can

be used for both write and read access of registers.

A write access in burst mode (bit[29]=1, see Figure 28. Write burst mode frames) consists of:

•

first 16 bits instruction on MOSI line

•

following m*16 bits data to be written in the consecutively addressed registers on MOSI line

•

first check byte + TRANS_F + blind echo of register address on MISO line

•

following m*16 bits previous register content on MISO line

Figure 28. Write burst mode frames

16 bit instruction

16 bit data

Check Byte

zz + 14 bit

previous register

content

16 bit data

previous register

content

…..

check correct number

of SCLK cycles (16+m*16)

GADG1001181326PS

A read access in burst mode (bit[29]=0, see Figure 29. Read burst mode frames) consists of:

•

first 16-bit instruction on MOSI line

•

following m*16 bit don’t care on MOSI line

•

first check byte + TRANS_F + blind echo of register address on MISO line

•

m*16 bit data corresponding to the content of consecutively addressed registers on MISO line

Figure 29. Read burst mode frames

16 bit instruction

xxxxxxxxxxxxxxxx

Check Byte

zz + 14 bit

16 bit data

xxxxxxxxxxxxxxxx

16 bit data

…..

check correct number

of SCLK cycles (16+m*16)

GADG1001181504PS

L9966

Burst mode

DS12459 - Rev 10

page 55/122

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