Silicon Laboratories Stepper Machine Especificações descarregar pdf (Página 107)

C8051F330/1

Rev. 1.1 107

Figure 13.2. OSCICL: Internal H-F Oscillator Calibration Register

Bit7: UNUSED. Read = 0. Write = don’t care.

Bits 6-0: OSCICL: Internal Oscillator Calibration Register.

This register determines the internal oscillator period as per Equation 13.1. The reset value for

OSCICL defines the internal oscillator base frequency. On C8051F330/1 devices, the reset value is

factory calibrated to generate an internal oscillator frequency of 24.5 MHz.

R R/W R/W R/W R/W R/W R/W R/W Reset Value

Var iab le

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:

0xB3

Figure 13.3. OSCICN: Internal H-F Oscillator Control Register

Bit7: IOSCEN: Internal H-F Oscillator Enable Bit.

0: Internal H-F Oscillator Disabled.

1: Internal H-F Oscillator Enabled.

Bit6: IFRDY: Internal H-F Oscillator Frequency Ready Flag.

0: Internal H-F Oscillator is not running at programmed frequency.

1: Internal H-F Oscillator is running at programmed frequency.

Bits5-2: UNUSED. Read = 0000b, Write = don't care.

Bits1-0: IFCN1-0: Internal H-F Oscillator Frequency Control Bits.

00: SYSCLK derived from Internal H-F Oscillator divided by 8.

01: SYSCLK derived from Internal H-F Oscillator divided by 4.

10: SYSCLK derived from Internal H-F Oscillator divided by 2.

11: SYSCLK derived from Internal H-F Oscillator divided by 1.

R/W R R R R R R/W R/W Reset Value

IOSCEN IFRDY - - - - IFCN1 IFCN0 11000000

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 SFR Address:

0xB2

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 203 204

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Silicon Laboratories Stepper Machine Especificações Página 107