cy8c20111 Cypress Semiconductor Corporation., cy8c20111 Datasheet - Page 22

• Manufacturer Part Number: cy8c20111
• Manufacturer: Cypress Semiconductor Corporation.

Document Number: 001-53516 Rev. **
04h
05h
06h
07h
08h
09h
0Ah
0Bh
Command
Code
Read POR Defaults
Read Device Configu-
ration (RAM)
Reconfigure Device
(POR)
Set Normal Operation
Mode
Set Setup Operation
Mode
Start CapSense
Scanning
Stop CapSense
Scanning
Returns CapSense
Scanning Status
Name
Reads the POR settings stored in the nonvolatile memory. To read POR defaults:
■
■
■
Reads the current device configuration. Gives the user "flat-address-space" access to
all device settings. To read device configuration:
■
■
■
Immediately reconfigures the device with actual POR defaults from Flash. Has the same
effect on the registers as a POR. This command can only be executed in setup operation
mode (command code 08).
Sets the device in normal operation mode. In this mode, CapSense pin assignments
cannot be modified; settling time, IDAC setting, external capacitor, and sensor
auto-reset also cannot be modified.
Sets the device in setup operation mode. In this mode, CapSense pin assignments can
be changed along with other parameters.
Allows the user to start CSA scanning after it has been stopped using command 0x0A.
Note that at POR, scanning is enabled and started by default if one or more sensors are
enabled.
Allows the user to stop CSA scanning. A system host controller might initiate this
command before powering down the device to make sure that during power down no
CapSense touches are detected.
When CSA scanning is stopped by the user and the device is still in the valid VCC
operating range, the following behavior is supported:
■
■
■
The I
value 0Bh to the A0h register, reading one byte returns the CSA scanning status. It
returns the LVD_STOP_SCAN and STOP_SCAN bits.
LVD_STOP_SCAN is bit 3 - Set when CSA is stopped because VCC is outside the valid
operating range. STOP_SCAN is bit 2 - Set when CSA is stopped by the user by writing
command 0x0A.
Write command 04h
Read 122 data bytes
Read one CRC byte
Write command 05h
Read 122 data bytes
Read one CRC byte
Any change to configuration can still be done (as long as VCC is in operating range).
Command code 0x06 overrides the status of stop/scan by enabling and starting CSA
scanning if one or more sensors are enabled.
CapSense read-back values return 0x00.
2
PRELIMINARY
C buffer is loaded with the one-byte CSA scanning status value. After writing the
Description
CY8C20111, CY8C20121
Page 22 of 34
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