C8051F502-IMR Silicon Laboratories Inc, C8051F502-IMR Datasheet - Page 173

• Manufacturer Part Number: C8051F502-IMR
• Description: MCU 8-Bit C8051F50x 8051 CISC 64KB Flash 2.5V/3.3V/5V 32-Pin QFN EP T/R
• Manufacturer: Silicon Laboratories Inc

Specifications of C8051F502-IMR

• Package: 32QFN EP
• Device Core: 8051
• Family Name: C8051F50x
• Maximum Speed: 50 MHz
• Ram Size: 4.25 KB
• Program Memory Size: 64 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 25
• Interface Type: I2C/SPI/UART
• On-chip Adc: 32-chx12-bit
• Operating Temperature: -40 to 125 °C
• Number Of Timers: 4

SFR Definition 19.6. OSCXCN: External Oscillator Control
SFR Address = 0x9F; SFR Page = 0x0F;
Reset
Name
Bit
6:4 XOSCMD[2:0] External Oscillator Mode Select.
2:0
Type
7
3
Bit
XFCN[2:0]
XTLVLD
XTLVLD
Unused
Name
R
7
0
Crystal Oscillator Valid Flag.
(Read only when XOSCMD = 11x.)
0: Crystal Oscillator is unused or not yet stable.
1: Crystal Oscillator is running and stable.
00x: External Oscillator circuit off.
010: External CMOS Clock Mode.
011: External CMOS Clock Mode with divide by 2 stage.
100: RC Oscillator Mode.
101: Capacitor Oscillator Mode.
110: Crystal Oscillator Mode.
111: Crystal Oscillator Mode with divide by 2 stage.
Read = 0b; Write =0b
External Oscillator Frequency Control Bits.
Set according to the desired frequency for Crystal or RC mode.
Set according to the desired K Factor for C mode.
XFCN
000
001
010
011
100
101
110
111
0
6
XOSCMD[2:0]
Crystal Mode
f  32 kHz
32 kHz  f  84 kHz
84 kHz  f  225 kHz
225 kHz  f  590 kHz 100 kHz  f  200 kHz
590 kHz  f  1.5 MHz 200 kHz  f  400 kHz
1.5 MHz  f  4 MHz
4 MHz  f  10 MHz
10 MHz  f  30 MHz
R/W
5
0
Rev. 1.2
4
0
RC Mode
f  25 kHz
25 kHz  f  50 kHz
50 kHz  f  100 kHz
400 kHz  f  800 kHz
800 kHz  f  1.6 MHz
1.6 MHz  f  3.2 MHz
Function
R
3
0
C8051F50x/F51x
2
0
C Mode
K Factor = 0.87
K Factor = 2.6
K Factor = 7.7
K Factor = 22
K Factor = 65
K Factor = 180
K Factor = 664
K Factor = 1590
XFCN[2:0]
R/W
1
0
0
0
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