C8051F330 Silicon Laboratories Inc, C8051F330 Datasheet - Page 60

• Manufacturer Part Number: C8051F330
• Description: IC 8051 MCU 8K FLASH 20MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F33xr

Specifications of C8051F330

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, Temp Sensor, 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
• Data Converters: A/D 16x10b; D/A 1x10b
• 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: -

C8051F330/1, C8051F330D
The Comparator output can be polled in software, used as an interrupt source, and/or routed to a Port pin.
When routed to a Port pin, the Comparator output is available asynchronous or synchronous to the system
clock; the asynchronous output is available even in STOP mode (with no system clock active). When dis-
abled, the Comparator output (if assigned to a Port I/O pin via the Crossbar) defaults to the logic low state,
and its supply current falls to less than 100 nA. See
page 115
externally driven from –0.25 V to (
electrical specifications are given in Table 8.1.
The Comparator response time may be configured in software via the CPT0MD register (see Figure 8.5).
Selecting a longer response time reduces the Comparator supply current. See Table 8.1 for complete tim-
ing and power consumption specifications.
The Comparator hysteresis is software-programmable via its Comparator Control register CPT0CN. The
user can program both the amount of hysteresis voltage (referred to the input voltage) and the positive and
negative-going symmetry of this hysteresis around the threshold voltage.
The Comparator hysteresis is programmed using Bits3-0 in the Comparator Control Register CPT0CN
(shown in Figure 8.3). The amount of negative hysteresis voltage is determined by the settings of the
CP0HYN bits. As shown in Figure 8.2, settings of 20, 10 or 5 mV of negative hysteresis can be pro-
grammed, or negative hysteresis can be disabled. In a similar way, the amount of positive hysteresis is
determined by the setting the CP0HYP bits.
Comparator interrupts can be generated on both rising-edge and falling-edge output transitions. (For Inter-
rupt enable and priority control, see
60
for details on configuring Comparator outputs via the digital Crossbar. Comparator inputs can be
(Programmed with CP0HYP Bits)
Positive Hysteresis Voltage
INPUTS
OUTPUT
VIN+
VIN-
CIRCUIT CONFIGURATION
Positive Hysteresis
CP0-
CP0+
VIN+
VIN-
Disabled
V
OL
V
Figure 8.2. Comparator Hysteresis Plot
OH
+
_
CP0
V
Section “8.3. Interrupt Handler” on page
DD ) + 0.25 V without damage or upset. The complete Comparator
Positive Hysteresis
Maximum
OUT
Rev. 1.2
Negative Hysteresis
Disabled
Section “14.1. Priority Crossbar Decoder” on
Negative Hysteresis
(Programmed by CP0HYN Bits)
Maximum
Negative Hysteresis Voltage
58). The CP0FIF flag is set