C8051F327 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F327

Full Speed USB, 16 kB Flash MCU Family

Silicon Laboratories 

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C8051F326/7

10.2. Internal Low-Frequency (L-F) Oscillator

C8051F326/7 devices include a low-frequency oscillator. The OSCLCN register (see SFR Definition 10.3)

is used to enabled the oscillator.

SFR Definition 10.3. OSCLCN: Internal L-F Oscillator Control

R/W

R

OSCLEN

—

Bit7

Bit6

R

R

R

R

R

R

Reset Value

—

—

—

—

—

—

0xxxxxxx

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0 SFR Address:

0xE3

Bit7:

Bit6–0:

OSCLEN: Internal L-F Oscillator Enable.

0: Internal L-F Oscillator Disabled.

1: Internal L-F Oscillator Enabled.

Unused. Read = 0000000b. Write = don’t care.

10.3. CMOS External Clock Input

A CMOS clock can be used as an external clock input. The CMOS clock should be wired to the XTAL2 pin

(P0.3) as shown in Figure 10.1 on Page 71. Port pins must be configured when using the external oscilla-

tor circuit. The Port I/O Crossbar should be configured to allow digital inputs be setting INPUTEN (GPI-

OCN.6). Also, P0.3 should be configured to open drain mode. See Section “11. Port Input/Output” on

page 79 for more information.

74

Rev. 1.1

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