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UART_RTS 23 O V
OL
max=0.2V
V
OH
min=2.8V
UART_DSR 10 I V
IL
max=0.8V
V
IH
min=2.1V
V
IH
max=3.7V
UART_DTR 12 O
V
OL
max=0.2V
V
OH
min=2.8V
Shared with GPIO3
UART_RI 6 I or O
O/P : V
OL
max=0.2V
V
OH
min=2.8V
I/P : V
IL
max=0.8V
V
IH
min=2.1V
V
IH
max=3.7V
Direction may be programmed.
UART_DCD 8 I or O
O/P : V
OL
max=0.2V
V
OH
min=2.8V
I/P : V
IL
max=0.8V
V
IH
min=2.1V
V
IH
max=3.7V
Direction may be programmed.
3.3.2.3 SPI Bus
Signal Name Pin No I/O Signal level Comments
SPI_MOSI 17 I
V
IL
max=0.8V
V
IH
min=2.1V
V
IH
max=3.7V
Used to reprogram Flash
SPI_MISO 5 O
V
OL
max=0.2V
V
OH
min=2.8V
SPI_CSB 7 I
V
IL
max=0.8V
V
IH
min=2.1V
V
IH
max=3.7V
SPI_CLK 9 I
V
IL
max=0.8V
V
IH
min=2.1V
V
IH
max=3.7V