C8051T617-GM Silicon Laboratories Inc, C8051T617-GM Datasheet - Page 108

• Manufacturer Part Number: C8051T617-GM
• Description: IC 8051 MCU 16K BYTE-PROG 24-QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051T61xr

Specifications of C8051T617-GM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Other names: 336-1438-5

C8051T610/1/2/3/4/5/6/7
20.2. Programmable Internal High-Frequency (H-F) Oscillator
All C8051T610/1/2/3/4/5/6/7 devices include a programmable internal high-frequency 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 20.2.
On C8051T610/1/2/3/4/5/6/7 devices, OSCICL is factory calibrated to obtain a 24.5 MHz base frequency.
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. The divide value defaults to 8 following a reset.
SFR Definition 20.2. OSCICL: Internal H-F Oscillator Calibration
SFR Address = 0xB3
108
Name
Reset
6:0 OSCICL[6:0] Internal Oscillator Calibration Bits.
Bit
Type
7
Bit
Unused
Name
R
7
0
Unused. Read = 0; Write = Don’t Care
These bits determine the internal oscillator period. When set to 0000000b, the H-F
oscillator operates at its fastest setting. When set to 1111111b, the H-F oscillator
operates at its slowest setting. The reset value is factory calibrated to generate an
internal oscillator frequency of 24.5 MHz.
Varies
6
Varies
5
Varies
Rev 1.0
4
OSCICL[6:0]
Function
Varies
R/W
3
Varies
2
Varies
1
Varies
0