PC87109VBE Nuvoton Technology Corporation of America, PC87109VBE Datasheet - Page 30

• Manufacturer Part Number: PC87109VBE
• Description: IC CONTROLLER ADV UART 32-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of PC87109VBE

• Features: Transmit Deferral
• Number Of Channels: 2, DUART
• Fifo's: 16 Byte
• Voltage - Supply: 5V
• With Irda Encoder/decoder: Yes
• With False Start Bit Detection: Yes
• With Modem Control: Yes
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *PC87109VBE

3.3.3 LCR/BSR - Link Control/Bank Select Registers
These registers are the same as in bank 0.
3.3.4 EXCR2 - Extended Control Register 2
This register is used to configure the transmitter and receiver FIFOs, and the baud generator prescaler.
Upon reset all bits are set to 0.
Bits
Function
Reset State
B1-0
B3-2
B5-4
B6
Reserved.
Read/write 0.
TF_SIZ [1-0] - TX_FIFO Levels Select.
These bits select the number of levels for the TX_FIFO.
They are effective only when the FIFOs are enabled.
RF_SIZ [1-0] - RX_FIFO Levels Select.
These bits select the number of levels for the RX_FIFO.
They are effective only when the FIFOs are enabled.
PRESL [1-0] - Prescaler Select.
The prescaler divides the 24 MHz input clock frequency to provide the clock for the baud generator.
TRANSMITTER
DMA LOGIC
DMA LOGIC
RECEIVER
CHANNEL
CHANNEL
Bits 1-0
Bits 3-2
Bits 5-4
LOCK
B7
0
00
01
10
11
00
01
1x
00
01
1x
TX_DMA
RX_DMA
res
B6
0
TX_FIFO Levels
RX_FIFO Levels
Prescaler Value
Figure 3-12. DMA Control Signals Routing
Figure 3-13. Extended Control Register 2
Reserved
Reserved
Reserved
16
32
13.0
DMA SWAP
PRESL1
16
32
DMASWP
1.625
1.0
LOGIC
B5
0
PRESL0
30
B4
0
CONFIGURATION
RF_SIZ1
MODULE
B3
ENABLE
0
LOGIC
DMA
RF_SIZ0
B2
0
DRQ
DACK
DMA
HANDSHAKE
SIGNALS
TF_SIZ1
B1
0
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TF_SIZ0
B0
0