The Infrared Wireless Expert
ACT-IR8250P
Specification
3. PIN Description
Symbol
Pin
No.
I/O
Type
Descriptions
TEST
1
I
Reserved. Pull low with 30k ohm resistor.
VCC
2
Pwr Digital supply voltage, positive terminal.
P2.5
3
I/O Reserved. Pull high with 30k ohm resistor.
VSS
4
Digital supply voltage, negative terminal. Ground,
XOUT
5
I/O Output terminal of crystal oscillator.
XIN 6
I
Input port for crystal oscillator. Standard crystals can be
connected.
nRST/NMI
7
I
Reset input. (n: Active low )
P2.0/nEnable 8 I
Power control from Host. (n: Active low )
High=Power down IR8250P, Low=Enable and power on.
P2.1/IR_SD 9 O
Shut down transceiver.
High=Shut down, Low=Enable.
P2.2/STOP_TX 10
I
TX flow control from host.
High=Host not ready to accept TX,
Low=Host ready to accept TX.
P3.0
11
I/O Reserved. Keep it open.
P3.1
12
I/O Reserved. Keep it open.
P3.2
13
I/O Reserved. Keep it open.
P3.3
14
I/O Reserved. Keep it open.
P3.4/TX 15
O
Serial data to Host.
High=Idle / Stop bit / 1-bit. Low=Start bit / 0-bit.
P3.5/RX 16 I
Serial data from Host.
High=Idle / Stop bit / 1-bit. Low=Start bit / 0-bit.
P3.6
17
I/O Reserved. Keep it open.
P3.7
18
I/O Reserved. Keep it open.
P2.3/IR_TX 19 O
Transmit data to transceiver.
High= IR on, Low=IR off.
P2.4
20
I/O Reserved. Keep it open.
P1.0/Status 21 O
IrDA status to Host.
High=No IrDA connection. Low=IrDA connection active.
P1.1/STOP_RX 22 O
RX flow control to Host.
High=IR8250P not ready to accept RX, Low=IR8250P ready to
P1.2/nIR_RX 23 I
Received data from transceiver. (n: Active low )
High=No IR, Low=IR detected.
© Copyright 2003-2005 ACTiSYS Corp. Page 6 of 25
Jan 28, 2005
Rev. 0.44
