C8051F121 Silicon Laboratories Inc, C8051F121 Datasheet - Page 186
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C8051F121
Manufacturer Part Number
C8051F121
Description
IC 8051 MCU FLASH 128K 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F12xr
Specifications of C8051F121
Core Processor
8051
Core Size
8-Bit
Speed
100MHz
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)
3 V ~ 3.6 V
Data Converters
A/D 8x8b, 8x12b; 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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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
Electrical specifications for the precision internal oscillator are given in Table 14.1. Note that the system
clock may be derived from the programmed internal oscillator divided by 1, 2, 4, or 8, as defined by the
IFCN bits in register OSCICN.
186
Bits 7–0: OSCICL: Internal Oscillator Calibration Register.
Bit 7:
Bit 6:
Bits 5–2: Reserved.
Bits 1–0: IFCN1-0: Internal Oscillator Frequency Control Bits.
IOSCEN
R/W
Bit7
R/W
Bit7
This register calibrates the internal oscillator period. The reset value for OSCICL defines the
internal oscillator base frequency. The reset value is factory calibrated to generate an inter-
nal oscillator frequency of 24.5 MHz.
IOSCEN: Internal Oscillator Enable Bit.
0: Internal Oscillator Disabled.
1: Internal Oscillator Enabled.
IFRDY: Internal Oscillator Frequency Ready Flag.
0: Internal Oscillator not running at programmed frequency.
1: Internal Oscillator running at programmed frequency.
00: Internal Oscillator is divided by 8.
01: Internal Oscillator is divided by 4.
10: Internal Oscillator is divided by 2.
11: Internal Oscillator is divided by 1.
SFR Definition 14.1. OSCICL: Internal Oscillator Calibration.
IFRDY
SFR Definition 14.2. OSCICN: Internal Oscillator Control
R/W
Bit6
Bit6
R
R/W
R/W
Bit5
Bit5
-
R/W
Bit4
Bit4
R
-
Rev. 1.4
R/W
Bit3
R/W
Bit3
-
R/W
Bit2
R/W
Bit2
-
IFCN1
R/W
R/W
Bit1
Bit1
SFR Address:
SFR Address:
SFR Page:
SFR Page:
IFCN0
R/W
R/W
Bit0
Bit0
0x8B
F
0x8A
F
Reset Value
11000000
Reset Value
Variable
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