参数资料
型号: AT87C58X2-SLRUM
厂商: Atmel
文件页数: 27/62页
文件大小: 0K
描述: MCU 8051 32K EPROM 44PLCC
标准包装: 500
系列: 87C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40/20MHz
连通性: UART/USART
外围设备: POR,WDT
输入/输出数: 32
程序存储器容量: 32KB(32K x 8)
程序存储器类型: OTP
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 带卷 (TR)
33
4431E–8051–04/06
AT/TS8xC54/8X2
13. ONCETM Mode (ON Chip Emulation)
The ONCE mode facilitates testing and debugging of systems using TS80C54/58X2 without
removing the circuit from the board. The ONCE mode is invoked by driving certain pins of the
TS80C54/58X2; 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 TS80C54/58X2 is in ONCE mode, an emulator or test CPU can be used to drive the
circuit Table 13-1 shows the status of the port pins during ONCE mode.
Normal operation is restored when normal reset is applied.
Table 13-1.
External Pin Status during ONCE Mode
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
XTAL1/2
Weak pull-up
Float
Weak pull-up
Active
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