msm9405 Oki Semiconductor, msm9405 Datasheet - Page 27

• Manufacturer Part Number: msm9405
• Description: Irda Communication Controller
• Manufacturer: Oki Semiconductor

¡ Semiconductor
MSM9405 upon sending/receiving. The FCR setting is applied to both interrupt and DMA.
When the system is reset, the FCR is set to the initial value.
FCR : FIFO Control Register (Address = 8h)
The FCR (FIFO Control Register) is used to set the threshold level of the FIFO to be used by the
FCR bit
FCR[0-3]
FCR[4-7]
FCR
7
FCR
TXTH (Transmit Threshold Select): These four bits set the following 16 sending threshold levels.
The initial value is set to "0111".
RXTH (Receive Threshold Select): These four bits set the following 16 receiving threshold levels.
The relationship between the FCR (4-7) value and receiveing threshold level is the same as the
relationship between the FCR (0-3) and sending threshold level. The initial value is set to "0111".
6
FCR
5
FCR
4
FCR (0-3)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
FCR
3
FCR
2
FCR
1
TX Threshold Level (Byte)
Description
FCR
0
01
02
04
06
08
10
12
14
16
18
20
22
24
26
28
30
TXTH (TX Threshold Select)
RXTH (RX Threshold Select)
MSM9405
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