W83627EHG Nuvoton Technology Corporation of America, W83627EHG Datasheet - Page 163

• Manufacturer Part Number: W83627EHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Bit 7, 6: These two bits are set to logical 1 when UFR, bit 0 = 1.
Bit 5, 4: These two bits are always logical 0.
Bit 3: In 16450 mode, this bit is logical 0. In 16550 mode, bits 3 and 2 are set to logical 1 when a
Bit 2, 1: These two bits identify the priority level of the pending interrupt, as shown in the table below.
Bit 0: This bit is logical 1 if there is no interrupt pending. If one of the interrupt sources has occurred,
Bit
3
0
0
0
1
0
time-out interrupt is pending. See the table below.
this bit is set to logical 0.
Bit
2
0
1
1
1
0
ISR
Bit
1
0
1
0
0
1
Bit
0
1
0
0
0
0
Interrupt
priority
First
Second
Second
Third
7
-
6
Interrupt Type
UART Receive
Status
RBR Data Ready
FIFO Data Timeout
TBR Empty
5
0
4
0
-
3
INTERRUPT SET AND FUNCTION
W83627EHF/EF, W83627EHG/EG
- 152 -
2
Interrupt Source
No Interrupt pending
1. OER = 1
3. NSER = 1
1. RBR data ready
2. FIFO interrupt active level
Data present in RX FIFO for 4
characters period of time since last
access of RX FIFO.
TBR empty
1
reached
0
0 if interrupt pending
Interrupt Status bit 0
Interrupt Status bit 1
Interrupt Status bit 2
FIFOs enabled
FIFOs enabled
4. SBD = 1
2. PBER =1
Clear Interrupt
Read USR
1. Read RBR
2. Read RBR until FIFO
data under active level
Read RBR
1. Write data into TBR
2. Read ISR (if priority is
third)
-