C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 117
C8051F321
Manufacturer Part Number
C8051F321
Description
IC 8051 MCU 16K FLASH 28MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F32xr
Datasheet
1.C8051F320R.pdf
(256 pages)
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
-
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13.
C8051F320/1 devices include a programmable internal oscillator, an external oscillator drive circuit, and a 4x Clock
Multiplier. The internal oscillator can be enabled/disabled and calibrated using the OSCICN and OSCICL registers,
as shown in Figure 13.1. The system clock (SYSCLK) can be derived from the internal oscillator, external oscillator
circuit, or the 4x Clock Multiplier divided by 2. The USB clock (USBCLK) can be derived from the internal oscilla-
tor, external oscillator, or 4x Clock Multiplier. Oscillator electrical specifications are given in Table 13.3 on page 126.
13.1. Programmable Internal Oscillator
All C8051F320/1 devices include a programmable internal oscillator that defaults as the system clock after a system
reset. The internal oscillator period can be programmed via the OSCICL register as defined by Equation 13.1, where
f
∆OSCICL is a change to the value held in register OSCICL.
BASE
VDD
Option 2
is the frequency of the internal oscillator following a reset, ∆T is the change in internal oscillator period, and
XTAL2
Option 1
OSCILLATORS
Equation 13.1. Typical Change in Internal Oscillator Period with OSCICL
Option 4
10MΩ
XTAL2
Option 3
XTAL2
XTAL1
XTAL2
OSCICL
∆T 0.0025
Figure 13.1. Oscillator Diagram
Circuit
Input
Programmable
Internal Clock
Generator
≅
OSCXCN
OSC
EN
×
EXOSC / 2
OSCICN
IOSC
EXOSC
------------ -
f
BASE
EXOSC
1
Rev. 1.1
IOSC
CLKMUL
×
∆OSCICL
n
Clock Multiplier
x 2
x 2
EXOSC / 2
EXOSC / 3
EXOSC / 4
IOSC / 2
EXOSC
C8051F320/1
CLKSEL
SYSCLK
USBCLK
117
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