Rainbow-electronics MAX3107 Bedienungsanleitung PDF herunterladen (Seite 43)

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MAX3107

SPI/I

C UART with 128-Word FIFOs

and Internal Oscillator

Bit 7: CLKtoRTS

Set the CLKtoRTS bit to 1 to route the baud-rate generator (16x baud rate) output clock to RTS/CLKOUT. The clock

frequency is a factor of 16x, 8x, or 4x of the baud rate, depending on the BRGConfig[5:4] settings.

Bits 6 and 5: No Function

Bit 4: ExtClock

Set the ExtClock bit high to enable an external clocking source (crystal or clock generator at XIN). Set the ExtClock bit

to 0 to select the internal oscillator for clocking.

Bit 3: PLLBypass

Set the PLLBypass bit high to enable bypassing the internal PLL and predivider.

Bit 2: PLLEn

Set the PLLEn bit high to enable the internal PLL. If PLLEn is set low, the internal PLL is disabled.

Bit 1: CrystalEn

Set the CrystalEn bit high to enable the crystal oscillator. When using an external clock source at XIN, CrystalEn must

be set low.

Bit 0: IntOscEn

Set the IntOscEn bit high to enable the internal oscillator. If IntOscEn is set low, the internal oscillator is disabled.

Bit 7–0: Bit[7:0]

The RevID register indicates the revision number of the MAX3107 silicon, starting with 0xA1. This can be used during

software development.

CLKSource—Clock Source Register

RevID—Revision Identification Register

ADDRESS: 0x1E

MODE: R/W

BIT 7 6 5 4 3 2 1 0

NAME

CLKtoRTS — — ExtClock PLLBypass PLLEn CrystalEn IntOscEn

RESET

0 0 0 0 1 0 0 0

ADDRESS: 0x1F

MODE: R

BIT 7 6 5 4 3 2 1 0

NAME

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

RESET

1 0 1 0 0 0 0 1

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 49 50 51

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Rainbow-electronics MAX3107 Bedienungsanleitung Seite 43