mcs7781 MosChip, mcs7781 Datasheet - Page 6

• Manufacturer Part Number: mcs7781
• Description: Usb To Irda Port
• Manufacturer: MosChip

Page 6
MCS7781
USB to IrDA Port
Mode Register
Offset: 0x00
SENDSIP
PARITY *
PLLPWD
CHGDIR
DRIVER
RESET
RATE *
SIPEN
Name
BBTG
ASK *
FIR *
SIR *
DTD
DIR
[7:5]
Bit
10
11
12
13
14
15
0
1
2
3
4
8
9
Access Default
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The “Rate” field (bits[7:5])
allow
desired BAUD Rate for
data transfers. This table
shows the data rates
available.
R
* Changes to these bits require resetting the IR System
0x01
0
0
1
0
0
1
0
1
0
1
0
1
1
selecting
1 = Puts the device in fast infrared mode (4 MHz).
0 = When cleared, puts the device in SIR/MIR mode based on Baud Rate register.
1 = The SIR pulse width of 1.6 uS is used.
0 = The SIR pulse used is 3/16th of bit time.
1 = Enables back to back transmission with no inter-packet gap.
1 = Puts the device in ASK mode.
0 = Device not in ASK mode.
1 = Odd parity to be used by ASK.
0 = Even parity is used
BAUD Rate selector.
1 = Enable power down feature of the PLL
0 = Power down feature of the PLL disabled.
1 = State after initialization.
0 = State after Reset.
1 = Device determines the transfer direction automatically.
0 = The direction is controlled by software by writing a 1 (TX) or 0 (RX) in DIR bit of
1 = Transmit
0 = Receive
1 = Enables the automatic generation of SIP pulse from the hardware.
0 = Disables the auto SIP generation.
On detecting a transition from low to high on this bit, the device generates a SIP.
1 = Software is allowed to change the transfer direction by writing to DIR bit.
0 = Direction change is not allowed.
0 = Resets the bridge and IR TOP modules.
this register
SIP is generated by software through vendor specific commands.
Software polls until this bit goes high before changing the direction.
the
Software should check the CHGDIR bit before writing to this bit.
This bit controls the direction of transfer.
This bit is valid only when AUTO = 0.
This bit self clearing.
Invalid in SIR mode.
Rate Field BAUD Selected
Description
0
1
2
3
4
5
6
7
0.576 Mbps
1.152 Mbps
115.2 Kbps
19.2 Kbps
38.4 Kbps
57.6 Kbps
2.4 Kbps
9.6 Kbps
Rev.
2.1