ADS1299
SBAS499A –JULY 2012–REVISED AUGUST 2012
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GPIO: General-Purpose I/O Register
Address = 14h
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
GPIOD4
GPIOD3
GPIOD2
GPIOD1
GPIOC4
GPIOC3
GPIOC2
GPIOC1
This register controls the action of the four GPIO pins.
Bits[7:4]
Bits[3:0]
GPIOD[4:1]: GPIO data
These bits are used to read and write data to the GPIO ports.
When reading the register, the data returned correspond to the state of the GPIO external pins, whether they are
programmed as inputs or as outputs. As outputs, a write to the GPIOD sets the output value. As inputs, a write to the
GPIOD has no effect.
GPIOC[4:1]: GPIO control (corresponding GPIOD)
These bits determine if the corresponding GPIOD pin is an input or output.
0 = Output
1 = Input (default)
MISC1: Miscellaneous 1
Address = 15h
BIT 7
0
BIT 6
0
BIT 5
SRB1
BIT 4
0
BIT 3
0
BIT 2
0
BIT 1
0
BIT 0
0
This register is for miscellaneous use.
Bits[7:6]
Bit 5
Must always be set to '0'
SRB1: Stimulus, reference, and bias 1
This bit connects the SRB1 to all eight channels inverting inputs.
0 = Switches open (default)
1 = Switches closed
Bits[4:0]
Must always be set to '0'
MISC2: Miscellaneous 2
Address = 16h
BIT 7
0
BIT 6
0
BIT 5
0
BIT 4
0
BIT 3
0
BIT 2
0
BIT 1
0
BIT 0
0
This register is for miscellaneous use.
Bits[7:0]
Must always be set to '0'
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