Rainbow-electronics MAX3107 Manual do Utilizador descarregar pdf (Página 42)

42 _____________________________________________________________________________________

MAX3107

SPI/I

C UART with 128-Word FIFOs

and Internal Oscillator

Bits 7 and 6: No Function

Bit 5: 4xMode

When the 4xMode bit is set high, the MAX3107 baud rate is quadruple the regular (16x sampling) baud rate. The

2xMode bit should be set low if 4xMode is enabled. See the 2x and 4x Rate Modes section for more information.

Bit 4: 2xMode

When the 2xMode bit is set high, the MAX3107 baud rate is double the regular (16x sampling) baud rate. See the 2x

and 4x Rate Modes section for a detailed description.

Bits 3–0: FRACT[3:0]

This is the fractional portion of the baud-rate generator divisor. Set FRACT[3:0] to zero if not used. See the Fractional

Baud-Rate Generator section for calculations.

DIVLSB and DIVMSB define the baud-rate generator integer divisors. The minimum value is 1. See the Fractional Baud

Rate Generator section for more information.

Bits 7–0: Div[7:0]

Div[7:0] are the 8 LSBs of the integer divisor portion (DIV) of the baud-rate generator.

Bits 7–0: Div[15:8]

Div[15:8] is the MSB portion of the integer divisor (DIV).

BRGConfig—Baud-Rate Generator Configuration Register

DIVLSB—Baud-Rate Generator LSB Divisor Register

DIVMSB—Baud-Rate Generator MSB Divisor Register

ADDRESS: 0x1B

MODE: R/W

BIT 7 6 5 4 3 2 1 0

NAME

— — 4xMode 2xMode FRACT3 FRACT2 FRACT1 FRACT0

RESET

0 0 0 0 0 0 0 0

ADDRESS: 0x1C

MODE: R/W

BIT 7 6 5 4 3 2 1 0

NAME

Div7 Div6 Div5 Div4 Div3 Div2 Div1 Div0

RESET

0 0 0 0 0 0 0 1

ADDRESS: 0x1D

MODE: R/W

BIT 7 6 5 4 3 2 1 0

NAME

Div15 Div14 Div13 Div12 Div11 Div10 Div9 Div8

RESET

0 0 0 0 0 0 0 0

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 50 51

C UART with 128-Word FIFOs 1

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