参数资料
型号: AT89S51-24PC
厂商: Atmel
文件页数: 30/31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: 0°C ~ 70°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
8
2487D–MICRO–6/08
AT89S51
Dual Data Pointer Registers: To facilitate accessing both internal and external data memory,
two banks of 16-bit Data Pointer Registers are provided: DP0 at SFR address locations 82H-
83H and DP1 at 84H-85H. Bit DPS = 0 in SFR AUXR1 selects DP0 and DPS = 1 selects DP1.
The user should ALWAYS initialize the DPS bit to the appropriate value before accessing the
respective Data Pointer Register.
Power Off Flag: The Power Off Flag (POF) is located at bit 4 (PCON.4) in the PCON SFR. POF
is set to “1” during power up. It can be set and rest under software control and is not affected by
reset.
Table 5-2.
AUXR: Auxiliary Register
AUXR
Address = 8EH
Reset Value = XXX00XX0B
Not Bit Addressable
WDIDLE
DISRTO
DISALE
Bit
765
4
3
2
1
0
Reserved for future expansion
DISALE
Disable/Enable ALE
DISALE
Operating Mode
0
ALE is emitted at a constant rate of 1/6 the oscillator frequency
1
ALE is active only during a MOVX or MOVC instruction
DISRTO
Disable/Enable Reset-out
DISRTO
0
Reset pin is driven High after WDT times out
1
Reset pin is input only
WDIDLE
Disable/Enable WDT in IDLE mode
WDIDLE
0
WDT continues to count in IDLE mode
1
WDT halts counting in IDLE mode
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