IC-MB4 datasheet(22/40 Pages) ICHAUS

22 / 40 page

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iC-MB4

BiSS INTERFACE MASTER

Rev B2, Page 22/40

MICROCONTROLLER INTERFACE

With pin CFGSPI the microcontroller interface is se-

lected between an 8 bit parallel interface or an SPI

serial interface. With pin CFGSPI = 0 the 8 bit parallel

microcontroller interface is selected in which the bidirec-

tional data bus alternately transmits addresses and data

in blocks of 8 bits (see figures 3). With pin INT_NMOT =

0 for an Intel 8051 controller or INT_NMOT = 1 for a

68HC11 Motorola controller communication type is se-

lected.

CFGSPI

INT_NMOT

Mode

Motorola 68HC11

Intel 8051

Table 11: Parallel communication modes

SPI Serial Microcontroller Interface

With pin CFGSPI = 1 the SPI serial microcontroller in-

terface is selected.

CFGSPI

INT_NMOT

Mode

SPI1 (polarity = 0,

phase = 0)

Table 12: SPI communication modes

When operated in conjunction with an SPI controller,

pin ALE is used as a clock input (SCK) and pin NCS

as an enable input (NCS), with DB0 as the data input

(SI) and DB1 as the data output (SO). Data is transmit-

ted serially in successive blocks of 8 bits (command,

address and data). Six commands are available:

• WriteData (0x02 = 0b0000 0010)

• ReadData (0x03 = 0b0000 0011)

• ReadStatus (0x05 = 0b0000 0101)

• WriteInstruction (0x07 = 0b0000 0111)

• ReadData0 (0x09 = 0b0000 1001)

• WriteData0 (0x0B = 0b0000 1011)

Figure 16: SPI transmission protocol (polarity 0, phase 0)

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