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參數(shù)資料
| 型號(hào)： | 73S1209F-EB |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 51/123頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL 73S1209F DOC/CD CABLE |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | * |
| 嵌入式： | * |
| 已用 IC / 零件： | * |
| 主要屬性： | * |
| 次要屬性： | * |
| 已供物品： | 板，線纜，CD，電源 |
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DS_1209F_004
73S1209F Data Sheet
Rev. 1.2
33
1.7.3.1
Interrupt Overview
When an interrupt occurs, the MPU will vector to the predetermined address as shown in Table 32. Once
the interrupt service has begun, it can only be interrupted by a higher priority interrupt. The interrupt
service is terminated by a return from the RETI instruction. When a RETI is performed, the processor will
return to the instruction that would have been next when the interrupt occurred.
When the interrupt condition occurs, the processor will also indicate this by setting a flag bit. This bit is
set regardless of whether the interrupt is enabled or disabled. Each interrupt flag is sampled once per
machine cycle, then samples are polled by the hardware. If the sample indicates a pending interrupt
when the interrupt is enabled, then the interrupt request flag is set. On the next instruction cycle, the
interrupt will be acknowledged by hardware forcing an LCALL to the appropriate vector address.
Interrupt response will require a varying amount of time depending on the state of the MPU when the
interrupt occurs. If the MPU is performing an interrupt service with equal or greater priority, the new
interrupt will not be invoked. In other cases, the response time depends on the current instruction. The
fastest possible response to an interrupt is 7 machine cycles. This includes one machine cycle for
detecting the interrupt and six cycles to perform the LCALL.
1.7.3.2
Special Function Registers for Interrupts
Interrupt Enable 0 Register (IEN0): 0xA8
0x00
Table 19: The IEN0 Register
MSB
LSB
EAL
WDT
–
ES0
ET1
EX1
ET0
EX0
Bit
Symbol
Function
IEN0.7
EAL
EAL = 0 – disable all interrupts.
IEN0.6
WDT
Not used for interrupt control.
IEN0.5
–
IEN0.4
ES0
ES0 = 0 – disable serial channel 0 interrupt.
IEN0.3
ET1
ET1 = 0 – disable timer 1 overflow interrupt.
IEN0.2
EX1
EX1 = 0 – disable external interrupt 1.
IEN0.1
ET0
ET0 = 0 – disable timer 0 overflow interrupt.
IEN0.0
EX0
EX0 = 0 – disable external interrupt 0.
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| 73S1209F-IM44 DK | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 73S1209F Dev Kit Eval Bd Ice Cable Cd |
| 73S1209F-IM44 EB | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 73S1209F Eval Brd Eval Bd Doc Cd Cable |
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| 73S1209F-IM68 EB | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 73S1209F Eval Brd Doc Cd Cable |
| 73S1210F | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Self-Contained Smart Card Reader with PINpad and Power Management |
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