參數(shù)資料
型號: W83977CTF-AW
英文描述: PERIPHERAL (MULTIFUNCTION) CONTROLLER
中文描述: 周邊(多功能)控制器
文件頁數(shù): 61/161頁
文件大?。?/td> 592K
代理商: W83977CTF-AW
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-52 -
Revision A1
TABLE 3-4 INTERRUPT CONTROL FUNCTION
ISR
INTERRUPT SET AND FUNCTION
Bit
3
Bit
2
Bit
1
Bit
0
Interrupt
priority
Interrupt Type
Interrupt Source
Clear Interrupt
0
0
0
1
-
-
No Interrupt pending
-
0
1
1
0
First
UART Receive
Status
1. OER = 1 2. PBER =1
3. NSER = 1 4. SBD = 1
Read USR
0
1
0
0
Second
RBR Data Ready
1. RBR data ready
2. FIFO interrupt active level
reached
1. Read RBR
2. Read RBR until FIFO
data under active level
1
1
0
0
Second
FIFO Data Timeout
Data present in RX FIFO for 4
characters period of time since last
access of RX FIFO.
Read RBR
0
0
1
0
Third
TBR Empty
TBR empty
1. Write data into TBR
2. Read ISR (if priority is
third)
0
0
0
0
Fourth
Handshake status
1. TCTS = 1 2. TDSR = 1
3. FERI = 1 4. TDCD = 1
Read HSR
** Bit 3 of ISR is enabled when bit 0 of UFR is logical 1.
3.2.7 Interrupt Control Register (ICR) (Read/Write)
This 8-bit register allows the five types of controller interrupts to activate the interrupt output signal
separately. The interrupt system can be totally disabled by resetting bits 0 through 3 of the Interrupt
Control Register (ICR). A selected interrupt can be enabled by setting the appropriate bits of this
register to a logical 1.
0
0
0
1
2
3
4
5
6
7
0
0
RBR data ready interrupt enable (ERDRI)
TBR empty interrupt enable (ETBREI)
UART receive status interrupt enable (EUSRI)
Handshake status interrupt enable (EHSRI)
Bit 7-4: These four bits are always logic 0.
Bit 3: EHSRI. Setting this bit to a logical 1 enables the handshake status register interrupt.
Bit 2: EUSRI. Setting this bit to a logical 1 enables the UART status register interrupt.
Bit 1: ETBREI. Setting this bit to a logical 1 enables the TBR empty interrupt.
Bit 0: ERDRI. Setting this bit to a logical 1 enables the RBR data ready interrupt.
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