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6.7 Serial Ports
6.7.1 RS-232 Interfaces
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;"<23..
#8.
#83
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8 24'4) 8 2-65
8 2-44
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0F8 7
Signal
PB0
OUT
RX0SWITCH
PB1
OUT
TX0EN
PB2
OUT
RX1SWITCH
PB3
OUT
TX1EN
PB4
OUT
RTS0
PB6
INP
CD0
PB7
INP
RI0
PD2
INP
RXD1
PD3
IO
TXD1/SQW
PD4
OUT
RS232EN
PE0
INP
RXD0
PE1
OUT
TXD0
PE6
INP
CTS0
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;"<23..
# ,
$
7
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
SER0 carrier detect
SER0 ring indicator
SER1 receive data
SER1 transmit data
Note: This pin has an alternate function and can serve as an SQW
interrupt from the RTC.
RS-232 driver enable, 0 = enable
SER0 receive data
SER0 transmit data
SER0 clear to send
8 24'4
#*7
$
8 2-44
$
Function
9B
9/ &
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$
6.7 Serial Ports
)
8 2-65
3. F
25
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