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3.1 Electric Characteristics
Function
Signal Name
Power
Vcc
Supply
GND
RS232
UART_TX
Interface
UART_RX
UART_CTS
UART_RTS
UART_DSR
UART_DTR
UART_RI
UART_DCD
External
VCC_1V8
Power
Supply
VCC_3V3
SPI Bus
SPI_MOSI
SPI_MISO
SPI_CSB
SPI_CLK
Pin No
I/O
Signal level
29
I
3.6V to 6V
11, 15,
18, 30,
36, 38
21
O
V
OL
V
OH
25
I
V
IL
V
IH
V
IH
19
I
V
IL
V
IH
V
IH
23
O
V
OL
V
OH
10
I
V
IL
V
IH
V
IH
12
O
V
OL
V
OH
6
I or O O/P : V
I/P : V
8
I or O O/P : V
I/P : V
39
O
1.8V typical
27
O
3.3V typical
17
I
V
IL
V
IH
V
IH
5
O
V
OL
V
OH
7
I
V
IL
V
IH
V
IH
9
I
V
IL
11 of 36
max=0.2V
min=2.8V
max=0.8V
min=2.10V
max=3.7V
max=0.8V
min=2.10V
max=3.7V
max=0.2V
min=2.8V
max=0.8V
min=2.10V
max=3.7V
max=0.2V
min=2.8V
max=0.2V
OL
V
min=2.8V
OH
max=0.8V
IL
V
min=2.10V
IH
V
max=3.7V
IH
max=0.2V
OL
V
min=2.8V
OH
max=0.8V
IL
V
min=2.10V
IH
V
max=3.7V
IH
max=0.8V
min=2.10V
max=3.7V
max=0.2V
min=2.8V
max=0.8V
min=2.10V
max=3.7V
max=0.8V
Comments
Ityp = 50mA
6 Ground
terminals to
be attached
in parallel
Shared with
GPIO3
Direction
may be
programme
d.
Direction
may be
programme
d.
For
monitoring
only. No
current
source
Used to
reprogram
Flash
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