C8051F127 Silicon Laboratories Inc, C8051F127 Datasheet - Page 185
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C8051F127
Manufacturer Part Number
C8051F127
Description
IC 8051 MCU 128K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F12xr
Specifications of C8051F127
Core Processor
8051
Core Size
8-Bit
Speed
50MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
32
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
8.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 8x8b, 8x10b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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14. Oscillators
The devices include a programmable internal oscillator and an external oscillator drive circuit. The internal
oscillator can be enabled, disabled, and calibrated using the OSCICN and OSCICL registers, as shown in
Figure 14.1. The system clock can be sourced by the external oscillator circuit, the internal oscillator, or the
on-chip phase-locked loop (PLL). The internal oscillator's electrical specifications are given in Table 14.1
on page 185.
Table 14.1. Oscillator Electrical Characteristics
–40°C to +85°C unless otherwise specified.
14.1. Internal Calibrated Oscillator
All devices include a calibrated internal oscillator that defaults as the system clock after a system reset.
The internal oscillator period can be adjusted via the OSCICL register as defined by SFR Definition 14.1.
OSCICL is factory calibrated to obtain a 24.5 MHz frequency.
Calibrated Internal Oscillator
Frequency
Internal Oscillator Supply
Current (from V
External Clock Frequency
T
T
XCH
XCL
(External Clock Low Time)
(External Clock High Time)
Parameter
VDD
Option 2
Option 3
XTAL1
DD
XTAL1
XTAL2
)
Option 1
Option 4
XTAL1
Figure 14.1. Oscillator Diagram
OSCICN.7 = 1
XTAL1
XTAL2
AGND
AV+
Conditions
OSCICL
Rev. 1.4
Circuit
Input
Calibrated
Oscillator
OSCXCN
Internal
C8051F120/1/2/3/4/5/6/7
EN
OSC
OSCICN
n
C8051F130/1/2/3
Min
24
—
15
15
0
PLL
CLKSEL
24.5
Typ
400
—
—
—
00
01
10
Max
25
—
30
—
—
SYSCLK
Units
MHz
MHz
µA
ns
ns
185
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