参数资料
型号: AT89S52-24AI
厂商: Atmel
文件页数: 9/37页
文件大小: 0K
描述: IC MCU 8K FLASH 24MHZ 44-TQFP
标准包装: 160
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: 8KB(8K x 8)
程序存储器类型: 闪存
RAM 容量: 256 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: 44-TQFP
包装: 托盘
17
1919D–MICRO–6/08
AT89S52
Figure 12-1. Timer 2 in Clock-Out Mode
13. Interrupts
The AT89S52 has a total of six interrupt vectors: two external interrupts (INT0 and INT1), three
timer interrupts (Timers 0, 1, and 2), and the serial port interrupt. These interrupts are all shown
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 13-1 shows that bit position IE.6 is unimplemented. User software should not
write a 1 to this bit position, since it may be used in future AT89 products.
Timer 2 interrupt is generated by the logical OR of bits TF2 and EXF2 in register T2CON. Nei-
ther of these flags is cleared by hardware when the service routine is vectored to. In fact, the
service routine may have to determine whether it was TF2 or EXF2 that generated the interrupt,
and that bit will have to be cleared in software.
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. However, the Timer 2 flag,
TF2, is set at S2P2 and is polled in the same cycle in which the timer overflows.
OSC
EXF2
P1.0
(T2)
P1.1
(T2EX)
TR2
EXEN2
C/T2 BIT
TRANSITION
DETECTOR
TIMER 2
INTERRUPT
T2OE (T2MOD.1)
÷2
TL2
(8-BITS)
RCAP2L RCAP2H
TH2
(8-BITS)
÷2
相关PDF资料
PDF描述
10FMN-SMT-A-TF CONN FMN HOUSING 10POS SIDE SMD
09FMN-SMT-A-TF CONN FMN HOUSING 9POS SIDE SMD
08FMN-SMT-A-TF CONN FMN HOUSING 8POS SIDE SMD
07FMN-SMT-A-TF CONN FMN HOUSING 7POS SIDE SMD
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