参数资料
型号: AT89C51ID2-SLRUM
厂商: Atmel
文件页数: 12/157页
文件大小: 0K
描述: IC 8051 MCU 64K FLASH 44-PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 500
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 标准包装
其它名称: AT89C51ID2-SLRUMDKR
109
AT89C51ID2
4289C–8051–11/05
ONCE(TM) Mode (ON
Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using AT89C51ID2 with-
out removing the circuit from the board. The ONCE mode is invoked by driving certain
pins of the AT89C51ID2; the following sequence must be exercised:
Pull ALE low while the device is in reset (RST high) and PSEN is high.
Hold ALE low as RST is deactivated.
While the AT89C51ID2 is in ONCE mode, an emulator or test CPU can be used to drive
the circuit Table 84 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 84. External Pin Status during ONCE Mode
(a) "Once" is a registered trademark of Intel Corporation.
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
Port I2
XTALA1/2
XTALB1/2
Weak
pull-up
Weak
pull-up
Float
Weak
pull-up
Weak
pull-up
Weak
pull-up
Float
Active
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