MAX14830 datasheet(49/68 Pages) MAXIM

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Maxim Integrated

Quad Serial UART with 128-Word FIFOs

MAX14830

GPIOConfg—GPIO Configuration Register

Each UART has four GPIOs that can be configured as inputs or outputs and can be operated in push-pull or open-drain

mode. The reference clock must be active for the GPIOs to work.

Bits 7–4: GP[n]OD

Each UART has four individually assigned GPIO outputs as follows: UART0: GPIO0–GPIO3, UART1: GPIO4–GPIO7,

UART2: GPIO8–GPIO11, UART3: GPIO12–GPIO15. For example, for UART0: Bit 4 is GP0OD, Bit 5 is GP1OD, Bit 6 is

GP2OD, and Bit 7 is GP3OD (see Table 5).

Set GP[n]OD bits to 0 to configure the GPIO_s as push-pull outputs, if configured as outputs in GPIOConfg[3:0].

Set the GP[n]OD bits to 1 to configure to open-drain output operation.

When configured as inputs in GPIOConfg[3:0], the GPIO_s are high-impedance inputs with weak pulldowns.

Bits 3–0: GP[n]Out

Each UART has four individually assigned GPIO outputs as follows: UART0: GPIO0–GPIO3, UART1: GPIO4–GPIO7,

UART2: GPIO8–GPIO11, UART3: GPIO12–GPIO15. For example, for UART0: Bit 0 is GP0Out, Bit 1 is GP1Out, Bit 2 is

GP2Out, and Bit 3 is GP3Out (see Table 5).

The GP[n]Out bits configure the GPIO_ to be inputs or outputs. Set the GP[n]Out bits to 1 to configure the associated

GPIO_s as outputs. Set the GP[n]Out bits to 0 to configure the associated GPIOs as inputs.

Table 5. UART GPIO Assignments for GPIO Configuration

ADDRESS:

0x18

MODE:

R/W

BIT

NAME

GP3OD

GP2OD

GP1OD

GP0OD

GP3Out

GP2Out

GP1Out

GP0Out

RESET

UART

GP3OD/GP3Out

GP2OD/GP2Out

GP1OD/GP1Out

GP0OD/GP0Out

UART0

GPIO3

GPIO2

GPIO1

GPIO0

UART1

GPIO7

GPIO6

GPIO5

GPIO4

UART2

GPIO11

GPIO10

GPIO9

GPIO8

UART3

GPIO15

GPIO14

GPIO13

GPIO12

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