C8051F93X-C8051F92X 查看數據表（PDF） - Silicon Laboratories

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C8051F93X-C8051F92X

Single/Dual Battery, 0.9–3.6 V, 64/32 kB, SmaRTClock, 10-Bit ADC MCU

Silicon Laboratories 

C8051F93x-C8051F92x

SFR Definition 19.4. OSCXCN: External Oscillator Control

Bit

7

6

5

4

3

2

1

0

Name XCLKVLD

Type

R

Reset

0

XOSCMD[2:0]

R

R/W

R/W

0

0

0

Reserved

R/W

0

XFCN[2:0]

R/W

R/W

R/W

0

0

0

SFR Page = 0x0; SFR Address = 0xB1

Bit Name

Function

7 XCLKVLD External Oscillator Valid Flag.

Provides External Oscillator status and is valid at all times for all modes of operation

except External CMOS Clock Mode and External CMOS Clock Mode with divide by

2. In these modes, XCLKVLD always returns 0.

0: External Oscillator is unused or not yet stable.

1: External Oscillator is running and stable.

6:4 XOSCMD External Oscillator Mode Bits.

Configures the external oscillator circuit to the selected mode.

00x: External Oscillator circuit disabled.

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.

3 Reserved Reserved.

Read = 0b. Must Write 0b.

2:0 XFCN External Oscillator Frequency Control Bits.

Controls the external oscillator bias current.

000-111: See Table 19.1 on page 193 (Crystal Mode) or Table 19.2 on page 194 (RC

or C Mode) for recommended settings.

Rev. 1.3

199

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