Table of Contents
Advertisement
6.12 I/O Pin Allocation
<
PA0-7
OUT
1
PB0
OUT
1
RX0SWITCH
PB1
OUT
0
TX0EN
PB2
OUT
1
RX1SWITCH
PB3
OUT
0
TX1EN
PB4
OUT
1
RTS0
PB5
OUT
1
DSR0
PB6
INP
1
CD0
PB7
INP
1
RI0
PC0-7
*OUT
x
PA0-PA7
PD0
*IO
0
SCL
PD1
*IO
0
SDA
PD2
*INP
1
RXD1
PD3
*IO
1
TXD1/SQW
PD4
OUT
0
RS232EN
PD5
*OUT
1
TXCAN
PD6
*INP
1
RXCAN
PD7
OUT
0
NICRST
PE0
*INP
1
RXD0
PE1
*OUT
1
TXD0
Daughter board
PE2
IO
1
GPIO
Daughter board
PE3
IO
1
GPIO
PE4
INP
1
DTR0
0F8 7
Signal
Port A
Multiplexed address and data lines
Port B
SER0 mode switch, 1 = RS232 mode
SER0 RS-485 transmitter enable, 0 = disabled
SER1 mode switch, 1 = RS232 mode
SER1 RS-485 transmitter enable, 0 = disabled
SER0 request to send
(not connected)
SER0 carrier detect (enable internal pull-up)
SER0 ring indicator (enable internal pull-up)
Port C
Address lines A8-A15
Port D
2
I
C clock (pulled up externally)
2
I
C data (pulled up externally)
SER1 receive data (enable internal pull-up)
SER1 transmit data (enable internal pull-up)
Note: This pin has an alternate function and can serve as
an SQW interrupt from the RTC.
RS-232 driver enable, 0 = enable
(not connected)
(not connected)
NIC reset signal
Port E
SER0 receive data (enable internal pull-up)
SER0 transmit data
(not connected, enable internal pull-up)
(not connected, enable internal pull-up)
(not connected, enable internal pull-up)
6.12 I/O Pin Allocation
Function
31
Advertisement
Table of Contents
