C8051F331 Silicon Laboratories Inc, C8051F331 Datasheet - Page 59

• Manufacturer Part Number: C8051F331
• Description: IC 8051 MCU 8K FLASH 20MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F33xr

Specifications of C8051F331

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

8.
C8051F330/1, C8051F330D devices include an on-chip programmable voltage comparator, Comparator0,
shown in Figure 8.1.
The Comparator offers programmable response time and hysteresis, an analog input multiplexer, and two
outputs that are optionally available at the Port pins: a synchronous “latched” output (CP0), or an asyn-
chronous “raw” output (CP0A). The asynchronous CP0A signal is available even when in when the system
clock is not active. This allows the Comparator to operate and generate an output with the device in STOP
mode. When assigned to a Port pin, the Comparator output may be configured as open drain or push-pull
(see
source (see
The Comparator0 inputs are selected in the CPT0MX register (Figure 8.4). The CMX0P1-CMX0P0 bits
select the Comparator0 positive input; the CMX0N1-CMX0N0 bits select the Comparator0 negative input.
Important Note About Comparator Inputs: The Port pins selected as comparator inputs should be con-
figured as analog inputs in their associated Port configuration register, and configured to be skipped by the
Crossbar (for details on Port configuration, see
Section “14.2. Port I/O Initialization” on page
Comparator0
Section “10.5. Comparator0 Reset” on page
CMX0N3
CMX0N2
CMX0N1
CMX0N0
CMX0P3
CMX0P2
CMX0P1
CMX0P0
Figure 8.1. Comparator0 Functional Block Diagram
P0.0
P0.2
P0.4
P0.6
P1.0
P1.2
P1.4
P1.6
P0.1
P0.3
P0.5
P0.7
P1.1
P1.3
P1.5
P1.7
CP0HYP1
CP0HYP0
CP0HYN1
CP0HYN0
CP0OUT
CP0RIF
CP0EN
CP0FIF
CP0 +
CP0 -
CP0MD1
CP0MD0
CP0RIE
CP0FIE
Section “14.3. General Purpose Port I/O” on page
C8051F330/1, C8051F330D
Rev. 1.2
+
-
GND
VDD
117). Comparator0 may also be used as a reset
CP0RIF
CP0FIF
Decision
Reset
92).
Tree
D
(SYNCHRONIZER)
SET
CLR
Q
Q
0
1
0
1
D
SET
CLR
Q
Q
CP0EN
Crossbar
0
1
EA
0
1
CP0A
Interrupt
CP0
CP0
120).
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