Analog Devices ADSP-SC573 EZ-KIT Manual page 30

• Each GPIO register controls eight signals (software switches).
GPIO Register
GPIOA
GPIOB
• By default, the Microchip MCP23017 GPIO signals function as input signals.
The signals must be programmed as output signals to override their default values. A zero is programmed into
the register to enable the signal as an output. The following table shows the Microchip register addresses.
IODIR Register
IODIRA
IODIRB
Each example in the Board Support Software (BSP) includes source files that program the soft switches, even if the
default settings are being used. The
their default values. The code that programs the soft switches is located in the
example where XXX is the name of the baord.
The following tables (I
each of the two Microchip MCP23017 devices.
2
Table 3-2: I C Hardware Address 0x21
GPIO
GPIOA
GPIOB
2
Table 3-3: I C Hardware Address 0x22
GPIO
GPIOA
GPIOB
The board schematic shows how the two Microchip GPIO expanders are connected to the board's ICs.
Tables Output Signals of Microchip GPIO Expander (U47 Port A) and Output Signals of Microchip GPIO Expand-
er (U47 Port B) show the output signals of the Microchip GPIO expander (U47), with a TWI address of
, where represents the read or write bit. The signals that control an individual FET have an entry in the FET
001X X
column. The Component Connected column shows the board IC that is connected if the FET is enabled. The Mi-
crochip ( ) is controlling the enable signal of a FET switch. Also note that if a particular functionality of the
U47
processor signal is being used, it is in bold font in the Processor Signal column.
®
ADSP-SC573 EZ-KIT Manual
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for each example identifies only the signals that are being changed from
README
2
C Hardware Address 0x21 and I
MCP23017 Register Address
0x12
0x13
MCP23017 Register Address
0x12
0x13
Register Address
0x12
0x13
IODIR Register Address
0x00
0x01
SoftConfig_XXX.c
2
C Hardware Address 0x22) outline the default values for
Default Value
0x02
0xC4
Default Value
0xE0
0xFF
Software-Controlled Switches (SoftConfig)
file in each
0100
3–7