- 您现在的位置：买卖IC网 > PDF目录11834 > XR88C681P/40-F (Exar Corporation)IC UART CMOS DUAL 40PDIP PDF资料下载
参数资料
| 型号： | XR88C681P/40-F |
| 厂商： | Exar Corporation |
| 文件页数： | 13/101页 |
| 文件大小： | 0K |
| 描述： | IC UART CMOS DUAL 40PDIP |
| 标准包装： | 9 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 1 字节，3 字节 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 带并行端口： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-PDIP |
| 包装： | 管件 |
| 其它名称： | 1016-1640 XR88C681P/40-F-ND |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页
XR88C681
19
Rev. 2.11
C. INTERRUPT CONTROL BLOCK
The Interrupt Control Block allows the user to apply the
DUART in an “Interrupt Driven” environment.
The
DUART includes an interrupt request output signal
(-INTR), which may be programmed to be asserted upon
the occurrence of any of the following events:
D
Transmit Hold Register A or B Ready
D
Receive Hold Register A or B Ready
D
Receive FIFO A or B Full
D
Start or End of Received Break in Channels A or B
D
End of Counter/Timer Count Reached
D
Change of State on input pins, IP0, IP1, IP2, IP3
The Interrupt Control Block consists of an Interrupt Status
Registers (ISR), an Interrupt Mask Registers (IMR), a
Masked Interrupt Status Registers (MISR) and an
Interrupt Vector Register (IVR).
Table 4 lists these
registers, their address location (within the DUART).
Register
Description
Address Location
(in DUART Address Space)
ISR
IMR
MISR
IVR
Interrupt Status Register
Interrupt Mask Register
Masked Interrupt Status Register
Interrupt Vector Register
0516 (Read Only)
0516 (Write Only)
0216 (Read Only)
0C16
Table 4. Listing and Brief Description of Interrupt System Registers
The role and purpose of each of these registers are
defined here.
C.1 Interrupt Status Registers (ISR)
The contents of the ISR indicates the status of all potential
interrupt conditions. If any bits within these registers are
toggled “high”, then the corresponding condition has or is
occurring. In general, the contents of the ISR will indicate
to the processor, the source or the reason for the Interrupt
Request from the DUART. Therefore, any interrupt
service routine for the DUART should begin by reading
either this register or the MISR (Masked Interrupt Status
Register). The bit-format of the ISR is presented in
Table 5:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Input Port
Change
Delta Break
B
RXRDY/
FFULLB
TXRDYB
Counter
Ready
Delta Break
A
RXRDY/
FFULLA
TXRDYA
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
Table 5. ISR Bit Format
The definition of the meaning behind each of these bits is
presented here.
ISR[7]: Input Port Change of State
If this bit is at a logic “1”, then a change of state was
detected at Input Port pins IP0 - IP3. The user would
service this interrupt by reading the IPCR (if ISR[7] = 1).
ISR[7] is cleared when the CPU has read the Input Port
Configuration Register (IPCR). By reading the IPCR, the
user will determine:
D
The individual Input Port pin that changed state
D
The final state of the monitored input ports, following
the Change of State.
For a detailed description of the IPCR, see
Section F.
Please note that in order to enable this Interrupt
Condition, the user must do two things:
1. Write the appropriate data to the lower nibble of the
Auxiliary Control Register, ACR[3:0]. In this step, the
user is specifying which Input Pins should trigger an
“Input Port Change” Interrupt request.
相关PDF资料 |
PDF描述 |
|---|---|
| MS27472T16B8PA | CONN RCPT 8POS WALL MT W/PINS |
| MS27473E12F8PA | CONN PLUG 8POS STRAIGHT W/PINS |
| VI-JWH-IW-F3 | CONVERTER MOD DC/DC 52V 100W |
| VI-JWH-IW-F2 | CONVERTER MOD DC/DC 52V 100W |
| VI-JWH-IW-F1 | CONVERTER MOD DC/DC 52V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XR88C681XR101524CNN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Telecommunication IC |
| XR88C681XR101524M | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Telecommunication IC |
| XR88C681XR101524N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Telecommunication IC |
| XR88C681XR101528CJJ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Telecommunication IC |
| XR88C681XR101528CNN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Telecommunication IC |
发布紧急采购，3分钟左右您将得到回复。