C8051F320 Silicon Laboratories Inc, C8051F320 Datasheet - Page 21

• Manufacturer Part Number: C8051F320
• Description: IC 8051 MCU 16K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F320

• 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: 25
• 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 17x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

1.1.3. Additional Features
The C8051F320/1 SoC family includes several key enhancements to the CIP-51 core and peripherals to improve per-
formance and ease of use in end applications.
The extended interrupt handler provides 16 interrupt sources into the CIP-51 (as opposed to 7 for the standard 8051),
allowing numerous analog and digital peripherals to interrupt the controller. An interrupt driven system requires less
intervention by the MCU, giving it more effective throughput. The extra interrupt sources are very useful when build-
ing multi-tasking, real-time systems.
Nine reset sources are available: power-on reset circuitry (POR), an on-chip VDD monitor (forces reset when power
supply voltage drops below V
transition), a Watchdog Timer, a Missing Clock Detector, a voltage level detection from Comparator0, a forced soft-
ware reset, an external reset pin, and an errant FLASH read/write protection circuit. Each reset source except for the
POR, Reset Input Pin, or FLASH error may be disabled by the user in software. The WDT may be permanently
enabled in software after a power-on reset during MCU initialization.
The internal oscillator is factory calibrated to 12 MHz ±1.5%, and the internal oscillator period may be user pro-
grammed in ~0.25% increments. A clock recovery mechanism allows the internal oscillator to be used with the 4x
Clock Multiplier as the USB clock source in Full Speed mode; the internal oscillator can also be used as the USB
clock source in Low Speed mode. External oscillators may also be used with the 4x Clock Multiplier. An external
oscillator drive circuit is also included, allowing an external crystal, ceramic resonator, capacitor, RC, or CMOS
clock source to generate the system clock. The system clock may be configured to use the internal oscillator, external
oscillator, or the Clock Multiplier output divided by 2. If desired, the system clock source may be switched on-the-fly
between oscillator sources. An external oscillator can be extremely useful in low power applications, allowing the
MCU to run from a slow (power saving) external clock source, while periodically switching to the internal oscillator
as needed.
XTAL1
XTAL2
Oscillator
Oscillator
Multiplier
External
Internal
Clock
Drive
Px.x
Px.x
RST
as given in Table 10.1 on page 105), the USB controller (USB bus reset or a VBUS
System
Clock
Clock Select
Figure 1.4. On-Chip Clock and Reset
Comparator 0
+
-
Detector
Missing
Clock
(one-
shot)
Microcontroller
EN
Extended Interrupt
C0RSEF
CIP-51
Core
Handler
VDD
WDT
PCA
EN
Supply
Monitor
+
-
System Reset
Rev. 1.1
Enable
Software Reset (SWRSF)
Power On
Reset
Operation
FLASH
Errant
Controller
'0'
USB
(wired-OR)
C8051F320/1
Transition
VBUS
Reset
Funnel
/RST
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