73M1903C-EVM Maxim Integrated Products, 73M1903C-EVM Datasheet - Page 15

• Manufacturer Part Number: 73M1903C-EVM
• Description: BOARD DEMO 73M1903C WORLDWIDE
• Manufacturer: Maxim Integrated Products

Specifications of 73M1903C-EVM

• Main Purpose: Interface, Analog Front End (AFE)
• Utilized Ic / Part: *
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Embedded: -

DS_1903C_033
4 GPIO Registers
The 73M1903C provides 8 user definable I/O pins. Each pin is programmed separately as either an input
or an output by a bit in a direction register. If the bit in the direction register is set high, the corresponding
pin is an input whose value is read from the GPIO data register. If it is low, the pin will be treated as an
output whose value is set by the GPIO data register.
To avoid unwanted current contention and consumption in the system from the GPIO port before the
GPIO is configured after a reset, the GPIO port I/Os are initialized to a high impedance state. The input
structures are protected from floating inputs, and no output levels are driven by any of the GPIO pins.
The GPIO pins are configured as inputs or outputs when the host controller (or DSP) writes to the GPIO
direction register. The GPIO direction and data registers are initialized to all ones (FFh) upon reset.
Register02 (DATA): Address 02h
Reset State FFh
Bit 7
GPIO7
GPIO(7:0)
Register03 (DIR): Address 03h
Reset State FFh
Bit 7
DIR7
DIR(7:0)
Rev. 5.0
Bit 6
GPIO6
Bit 6
DIR6
(0X02[7:0])
corresponding direction register bit is a 0. Reading this address will return data reflecting
the values of pins GPIO(7:0).
(0X03[7:0])
outputs. If the register bit is reset to 0, the corresponding GPIO pin is programmed as an
output. If the register bit is set to a 1, the corresponding pin will be configured as an input.
Bit 5
GPIO5
Bit 5
DIR5
Bits in this register will be asserted on the GPIO(7:0) pins if the
This register is used to designate the GPIO pins as either inputs or
Bit 4
GPIO4
Bit 4
DIR4
Bit 3
GPIO3
Bit 3
DIR3
Bit 2
GPIO2
Bit 2
DIR2
Bit 1
GPIO1
Bit 1
DIR1
Bit 0
DIR0
Bit 0
GPIO0
73M1903C Data Sheet
15