40 _____________________________________________________________________________________
MAX3107
SPI/I
2
C UART with 128-Word FIFOs
and Internal Oscillator
The XOFF1 and XOFF2 register contents define the XOFF characters for automatic XON/XOFF flow control and/or spe-
cial characters used in special character detection. See details in the FlowCtrl register description.
Bits 7–0: Bit[7:0]
These bits define the XOFF2 character if automatic software flow control is enabled in FlowCntrl[7:4]. If double-charac-
ter flow control is selected in FlowCntrl[7:4], these bits constitute the MSB of the XOFF character. If special character
detection is enabled in MODE2[4] and automatic flow control is not enabled, these bits define a special character.
If both special character detection and automatic flow control are enabled (MODE2[4] and FlowCntrl[3]), these bits
define a special character.
The four GPIOs can be configured as inputs or outputs and can be operated in push-pull or open-drain mode. The
reference clock has to be active for the GPIOs to work.
Bits 7–4: GP[3:0]OD
Set the GP[3:0]OD bits to 1 to configure open-drain output or input operation. If GP[3:0]OD are 0 (default), the
GPIO_are push-pull outputs, if configured as outputs in GPIOConfg[3:0]. If configured as inputs in GPIOConfg[3:0],
the GPIO_ are high-impedance inputs with weak pulldowns.
Bits 3–0: GP[3:0]Out
The GP[3:0]Out bits configure the GPIO_ to be inputs or outputs. Set the GP[3:0]Out bits high to configure the associ-
ated GPIO_ as outputs. The GP[3:0]Out bits which are set low, are configured to be inputs.
Bits 7–4: GPI[3:0]Dat
The GPI[3:0]Dat bits reflect the logic on GPIO_ when configured as inputs through GPIOConfg[3:0].
Bits 3–0: GPO[3:0]Dat
The GPO[3:0]Dat bits allows programming the logic state of the GPIO_, when these are configured as outputs through
GPIOConfg[3:0]. For open-drain operation, pullup resistors are needed on GPIO_.
XOFF2 Register
GPIOConfg—GPIO Configuration Register
GPIOData—GPIO Data Register
ADDRESS: 0x17
MODE: R/W
BIT 7 6 5 4 3 2 1 0
NAME
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
RESET
0 0 0 0 0 0 0 0
ADDRESS: 0x18
MODE: R/W
BIT 7 6 5 4 3 2 1 0
NAME
GP3OD GP2OD GP1OD GP0OD GP3Out GP2Out GP1Out GP0Out
RESET
0 0 0 0 0 0 0 0
ADDRESS: 0x19
MODE: R/W
BIT 7 6 5 4 3 2 1 0
NAME
GPI3Dat GPI2Dat GPI1Dat GPI0Dat GPO3Dat GPO2Dat GPO1Dat GPO0Dat
RESET
0 0 0 0 0 0 0 0
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