CapSense Express Controllers Registers TRM, Document No. 001-91082 Rev. *E
24
Register Mapping
1.5
Register Map
The CY8CMBR3xxx family features an I
2
C configurable register map. The CY8CMBR3xxx registers are divided into three
categories, as the following table shows.
The CY8CMBR3xxx devices feature a safe register map update mechanism to overcome configuration data corruption, which
can occur due to power failure during execution of “Save” command or any other spurious events.
If the configuration data is corrupted when the device is saving data, on the next reset, the devices reconfigure themselves to
the last known valid configuration. If there is no valid configuration saved by user, the devices load the factory default config-
uration
.
The following table provides all registers available in CY8CMBR3xxx family. Refer to
Factory Default Values on page 6
details on which register is applicable to which device.
CY8CMBR3xxx Registers
Register Cate-
gory
Register Map
Address range
Description
Configuration
Registers
0x00-0x7E
These registers contain the configuration data for the CY8CMBR3xxx controllers. A host
can write into these registers and save the data to non-volatile memory by writing to
command register. Note that the new configuration takes effect only after the
configuration is saved to non-volatile memory and the device is reset.
Command
Registers
0x80-0x87
These registers accept commands from host. Any command written to these register is
executed within T
I2C_LATENCY_ MAX
from the I
2
C acknowledgement of the command.
Refer to
for value of TI2C_LATENCY_ MAX.
Status Registers
0x88-0xFB
These are read only registers and indicate the status of command execution, system
diagnostics and sensor data.
Register Name
Address
0x00
0x02
0x04
0x06
0x08
0x09
0x0a
0x0b
0x0c
0x0d
0x0e
0x0f
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1a
