33889 datasheet(40/60 Pages) FREESCALE

40 / 60 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33889

FUNCTIONAL DEVICE OPERATION

LOGIC COMMANDS AND REGISTERS

SPI INTERFACE

Figure 20. Data Format Description

The SPI is a 8 bit SPI. First 3 bits are used to identify the internal SBC register address, bit 4 is a read/write bit. The last 4 bits

are data send from MCU to SBC or read back from SBC to MCU.

During write operation state of MISO has no signification.

During read operation only the last 4 bits at MISO have a meaning (content of the accessed register)

Following tables describe the SPI register list, and register bit meaning.

Registers “reset value” is also described, as well as the “reset condition”. reset condition is the condition which cause the bit

to be set at the “reset value”.

Possible reset condition are:

Power On Reset: POR

SBC mode transition:

NR2R - Normal Request to Reset mode

NR2N - Normal Request to Normal mode

N2R - Normal to Reset mode

STB2R - Standby to Reset mode

STO2R - Stop to Reset mode

SBC mode:RESET - SBC in Reset mode

MOSI

MISO

Bit0

Bit1

Bit2

Bit3

Bit4

Bit5

Bit6

Bit7

R/W

data

address

Read operation: R/W bit = 0

Write operation: R/W bit = 1

33889 Datasheet(PDF) 40 Page - Freescale Semiconductor, Inc