C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 58

• Manufacturer Part Number: C8051F321
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F320/1
Comparator outputs can be polled in software, used as an interrupt source, and/or routed to a Port pin. When routed to
a Port pin, Comparator outputs are available asynchronous or synchronous to the system clock; the asynchronous out-
put is available even in STOP mode (with no system clock active). When disabled, the Comparator output (if
assigned to a Port I/O pin via the Crossbar) defaults to the logic low state, and supply current falls to less than
100 nA. See
via the digital Crossbar. Comparator inputs can be externally driven from -0.25 V to (VDD) + 0.25 V without damage
or upset. The complete Comparator electrical specifications are given in Table 7.1.
Comparator response time may be configured in software via the CPTnMD registers (see Figure 7.6 and Figure 7.9).
Selecting a longer response time reduces the Comparator supply current. See Table 7.1 for complete timing and sup-
ply current specifications.
58
CMX1N1
CMX1N0
CMX1P1
CMX1P0
Note: P2.6 and P2.7 available
Section “14.1. Priority Crossbar Decoder” on page 129
only on C8051F320
P1.2
P1.6
P2.2
P2.6
P1.3
P1.7
P2.3
P2.7
Figure 7.2. Comparator1 Functional Block Diagram
CP1HYN1
CP1HYN0
CP1HYP1
CP1HYP0
CP1OUT
CP1RIF
CP1EN
CP1FIF
CP1 +
CP1 -
CP1MD1
CP1MD0
CP1RIE
CP1FIE
Rev. 1.1
+
-
GND
VDD
(SYNCHRONIZER)
D
for details on configuring Comparator outputs
SET
CLR
Q
Q
D
SET
CLR
Q
Q
Rising-edge
CP1
Crossbar
Interrupt
Logic
Falling-edge
Interrupt
CP1
CP1A
CP1
CP1
CP1RIE
CP1FIE