IC-MB4_15 Datasheet, PDF (23/40 Pages) IC-Haus GmbH – BiSS INTERFACE MASTER

iC-MB4
BiSS INTERFACE MASTER
preliminary
Rev B2, Page 23/40
The first two commands can be used to write data
to or read data from iC-MB4’s registers. The latter
commands are shortend write commands and read
commands with a set start address. In the read data
command a delay between the address and the first
data is necessary.
For fast access use the SPI commands ”ReadStatus”,
”WriteInstruction” and ”ReadData0”.
Additional 2nd SPI Serial Microcontroller Interface
With the active SPI serial microcontroller interface an
additional SPI interface can be addressed for dedicated
register access and reduced function set.
CFGSPI
1
NWR_E
0
Mode
SPI2, optional (polarity =
0, phase = 0)
Table 13: SPI communication modes
• ReadStatus to read the status register in 0xF0
• WriteInstruction to write the instruction register in
0xF4
• ReadData0 to read SDATA register starting at 0x00
This means that it is not necessary to give an address,
with the data directly adhering to the command. With
all commands it is possible to transmit several bytes of
data consecutively if the NCS signal is not reset and
ALE/SCK continues to be clocked. The address trans-
mitted (240 for ReadStatus and 244 for WriteInstruction)
is then the start address which is internally increased
by 1 following each transmitted byte.
An additional SPI interface at DB4 . . . DB7 is available
for exclusive read access to the SCD single cycle data
RAM of the slaves 5 to 8. The 2nd SPI interface is
enabled with NWR_E = 0. Access to status, instruction
and parameter register is not possible.
The 2. SPI does only provide the SPI command ”Read-
Data” with a limited address range of 0x40 . . . 0x7F.
• ReadData (0x03 = 0b0000 0011)
The 2nd SPI can neither be used to configure nor
to read status.
This 2nd SPI can only be used to read SCDATA
from 0x40 . . . 0x7F.