C8051F800DK Silicon Laboratories Inc, C8051F800DK Datasheet - Page 73
![KIT DEV C8051F800](/photos/28/94/289400/mcudevkit_sml.jpg)
C8051F800DK
Manufacturer Part Number
C8051F800DK
Description
KIT DEV C8051F800
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F800DK
Contents
Board, Cables, CD, Debugger, Power Supply
Processor To Be Evaluated
C8051F800
Data Bus Width
16 bit
Interface Type
USB
Operating Supply Voltage
7 V to 15 V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F8xx
Lead Free Status / Rohs Status
Supplier Unconfirmed
Other names
336-1797
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13.4. CS0 Comparator
The CS0 comparator compares the latest capacitive sense conversion result with the value stored in
CS0THH:CS0THL. If the result is less than or equal to the stored value, the CS0CMPF bit(CS0CN:0) is set
to 0. If the result is greater than the stored value, CS0CMPF is set to 1.
If the CS0 conversion accumulator is configured to accumulate multiple conversions, a comparison will not
be made until the last conversion has been accumulated.
An interrupt will be generated if CS0 greater-than comparator interrupts are enabled by setting the ECS-
GRT bit (EIE2.1) when the comparator sets CS0CMPF to 1.
If auto-scan is running when the comparator sets the CS0CMPF bit, no further auto-scan initiated conver-
sions will start until firmware sets CS0BUSY to 1.
A CS0 greater-than comparator event can wake a device from suspend mode. This feature is useful in sys-
tems configured to continuously sample one or more capacitive sense channels. The device will remain in
the low-power suspend state until the captured value of one of the scanned channels causes a CS0
greater-than comparator event to occur. It is not necessary to have CS0 comparator interrupts enabled in
order to wake a device from suspend with a greater-than event.
Note:
For a summary of behavior with different CS0 comparator, auto-scan, and auto accumulator settings,
please see Table 13.1.
P0MDIN = 0xF2
P1MDIN = 0x04
CS0CN = 0x80
CS0SE = 0x0D
CS0CF = 0x70
CS0SS = 0x02
On waking from suspend mode due to a CS0 greater-than comparator event, the CS0CN register
should be accessed only after at least two system clock cycles have elapsed.
SFR Configuration:
Configures P1.0-P1.1
and P1.3-P1.7 as
analog inputs
Enables Capsense0
Enables Auto-scan
as start-of-
conversion source
Sets P0.2 as Auto-
scan starting channel
Sets P1.5 as Auto-
scan ending channel
Configures P0.3,
P0.2, P0.0 as analog
inputs
Figure 13.2. Auto-Scan Example
Rev. 1.0
A
D
A
A
D
D
D
D
A
A
D
A
A
A
A
A
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
. . .
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
C8051F80x-83x
analog inputs result
Scans on channels
values that cannot
not configured as
in indeterminate
Interrupt event
Greater Than
trigger a CS0
73
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