参数资料
型号: AT89S51-24PI
厂商: Atmel
文件页数: 3/31页
文件大小: 0K
描述: IC 8051 MCU 4K FLASH 40-DIP
标准包装: 10
系列: 89S
核心处理器: 8051
芯体尺寸: 8-位
速度: 24MHz
连通性: UART/USART
外围设备: WDT
输入/输出数: 32
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
11
2487D–MICRO–6/08
AT89S51
10. Interrupts
The AT89S51 has a total of five interrupt vectors: two external interrupts (INT0 and INT1), two
timer interrupts (Timers 0 and 1), and the serial port interrupt. These interrupts are all shown in
Each of these interrupt sources can be individually enabled or disabled by setting or clearing a
bit in Special Function Register IE. IE also contains a global disable bit, EA, which disables all
interrupts at once.
Note that Table 10-1 shows that bit positions IE.6 and IE.5 are unimplemented. User software
should not write 1s to these bit positions, since they may be used in future AT89 products.
The Timer 0 and Timer 1 flags, TF0 and TF1, are set at S5P2 of the cycle in which the timers
overflow. The values are then polled by the circuitry in the next cycle.
Table 10-1.
Interrupt Enable (IE) Register
(MSB)
(LSB)
EA
ES
ET1
EX1
ET0
EX0
Enable Bit = 1 enables the interrupt.
Enable Bit = 0 disables the interrupt.
Symbol
Position
Function
EA
IE.7
Disables all interrupts. If EA = 0, no interrupt is
acknowledged. If EA = 1, each interrupt source is
individually enabled or disabled by setting or clearing its
enable bit.
IE.6
Reserved
IE.5
Reserved
ES
IE.4
Serial Port interrupt enable bit
ET1
IE.3
Timer 1 interrupt enable bit
EX1
IE.2
External interrupt 1 enable bit
ET0
IE.1
Timer 0 interrupt enable bit
EX0
IE.0
External interrupt 0 enable bit
User software should never write 1s to reserved bits, because they may be used in future AT89
products.
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