ADSP-SC589 EZ-Board® Evaluation System Manual
32
GPIO
MCP23017 Register Address
Default Value
GPIOA
0x12
0xB9
GPIOB
0x13
0x3F
The ADSP-SC589 EZ-Board Schematic shows how the two Microchip GPIO expanders are
connected to the board's ICs.
The tables below show the output signals of the Microchip GPIO expander (U47), with a TWI address
of 0100 001X, where X represents the read or write bit. The signals that control an individual FET
have an entry under the
column. The
column shows the board IC that is
FET
Component Connected
connected if the FET is enabled. The Microchip (U47) is controlling the enable signal of a FET
switch. Also note that if a particular functionality of the processor signal is being used, it will be in
under the
column.
bold font
Processor Signal
Output Signals of Microchip GPIO Expander (U47 Port A)
Bit Signal Name
Description FET
Processor Signal
(if applicable)
Component
Connected
Default
0
EEPROM_EN
SPI
EEPROM
CS
U9
PD_01/
/ ACM0_A4/SMC0_AOE/
SPI0_SEL2
SPI0_SS
U40
High
1
UART0_FLOW_EN
UART0
Flow
Control
U26
PC_15/
/ PPI0_FS3/ACM0_A2/
UART0_RTS
SMC0_AMS0, PD_00/
/ PPI0_D23
UART0_CTS
/ACM0_A3/ SMC0_D07
U7
High
2
UART0_EN
Enables
UART0
U26
PC_13/
/ SPI1_SEL1/ACM0_A0,
UART0_TX
PC_14/
/ ACM0_A1/TM0_ACI0
UART0_RX
U7
Low
3
ETH0_EN
Enables
Ethernet 0
U2,
U29
EMAC0 signals
U46
Low
4
ETH1_EN
Enables
Ethernet 1
U28
EMAC1 signals
U51
Low
5
MLB3_EN
Enables
MLB3
None
J20
High
