VAR-320SBC Reference Guide
Copyright © 2008 Variscite
4.3. UART Ports
The VAR-320SBC outputs 3 UARTs
•
Full function UART (FFUART)
•
Bluetooth UART (BTUART)
•
Standard UART (STUART)
Each serial port contains a UART and a slow serial infrared transmit encoder and receive decoder
that conform to the IrDA serial infrared specification.1
Each UART includes a programmable baud-rate generator. The supported baud rates are 9600,
19.2 K, 38.4 K, 57.6 K, 115.2 K, 230 K, 460 K, and 921 K.
Receive and transmit FIFO fill and drain operations can be done using programmed IO or DMA
transfers. To minimize CPU overhead for UART communications, device driver software can
setup interrupts and DMA for data transfers to/from memory.
All three UARTs support the 16550A and 167502 functions.
Full function UART (FFUART) signals:
Signal
Pin number
Type Description
GPIO
FFRXD P1-27
I FFUART
RXD
41
FFTXD P1-29
O FFUART
TXD
42
FFDCD P1-33
I FFUART
DCD
44
FFDTR P1-35
O FFUART
DTR
47
FFDSR P1-37
I FFUART
DSR
45
FFCTS P1-39
I FFUART
CTS
43
FFRTS P1-41
O FFUART
RTS
48
FFRI P1-45 I
FFUART
RI
46
Bluetooth UART (BTUART) signals:
Signal
Pin number Type
Description
GPIO
BT_TXD
P1-22
O
BT UART TXD
111
BT_RXD
P1-24
I
BT UART RXD
110
BT_CTS
P1-28
I
BT UART CTS
112
BT_RTS
P1-30
O
BT UART RTS
109
Standard UART (STUART) signals:
16