C8051F127 Silicon Laboratories Inc, C8051F127 Datasheet - Page 193
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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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To shut down the PLL, the system clock should be switched to the internal oscillator or a stable external
clock source, using the CLKSEL register. Next, disable the PLL by setting PLLEN (PLL0CN.1) to ‘0’.
Finally, the PLL can be powered off, by setting PLLPWR (PLL0CN.0) to ‘0’. Note that the PLLEN and
PLLPWR bits can be cleared at the same time.
Bits 7–5: UNUSED: Read = 000b; Write = don’t care.
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
R/W
Bit7
-
PLLCK: PLL Lock Flag.
0: PLL Frequency is not locked.
1: PLL Frequency is locked.
RESERVED. Must write to ‘0’.
PLLSRC: PLL Reference Clock Source Select Bit.
0: PLL Reference Clock Source is Internal Oscillator.
1: PLL Reference Clock Source is External Oscillator.
PLLEN: PLL Enable Bit.
0: PLL is held in reset.
1: PLL is enabled. PLLPWR must be ‘1’.
PLLPWR: PLL Power Enable.
0: PLL bias generator is de-activated. No static power is consumed.
1: PLL bias generator is active. Must be set for PLL to operate.
page 199
should be disabled whenever the FLRT bits are changed to a lower setting.
R/W
Bit6
-
). Important Note: Cache reads, cache writes, and the prefetch engine
SFR Definition 14.5. PLL0CN: PLL Control
R/W
Bit5
-
PLLLCK
Bit4
R
Rev. 1.4
R/W
Bit3
0
C8051F120/1/2/3/4/5/6/7
PLLSRC
R/W
Bit2
C8051F130/1/2/3
PLLEN
R/W
Bit1
SFR Address:
PLLPWR 00000000
SFR Page:
R/W
Bit0
0x89
F
Reset Value
193
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