C8051F360 datasheet(170/288 Pages) SILABS

170 / 288 page

C8051F360/1/2/3/4/5/6/7/8/9

170

Rev. 1.0

16.1.1. Internal Oscillator Suspend Mode

When software writes a logic ‘1’ to SUSPEND (OSCICN.5), the internal oscillator is suspended. If the sys-

tem clock is derived from the internal oscillator, the input clock to the peripheral or CIP-51 will be stopped

until one of the following events occur:

•

Port 0 Match Event.

•

Port 1 Match Event.

•

Port 2 Match Event.

•Comparator 0 enabled and output is logic ‘0’.

•Comparator 1 enabled and output is logic ‘0’.

When one of the internal oscillator awakening events occur, the internal oscillator, CIP-51, and affected

peripherals resume normal operation, regardless of whether the event also causes an interrupt. The CPU

resumes execution at the instruction following the write to SUSPEND.

Note: Before entering SUSPEND mode, SYSCLK should be switched to run off of the internal oscillator

and not the PLL. When the CPU wakes due to the awakening event, the PLL must be reinitialized before

switching back to it as the SYSCLK source.

SFR Definition 16.1. OSCICL: Internal Oscillator Calibration

Bits 7–0: OSCICL: Internal Oscillator Calibration Register.

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.

SFR Page:

SFR Address:

0xBF

R/W

Reset Value

Variable

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

C8051F360 Datasheet(PDF) 170 Page - Silicon Laboratories