参数资料
型号: AT80251G2D-SLSUM
厂商: Atmel
文件页数: 40/77页
文件大小: 0K
描述: IC 8051 MCU ROMLESS 44PLCC
标准包装: 972
系列: 8x251
核心处理器: C251
芯体尺寸: 8/16-位
速度: 24MHz
连通性: EBI/EMI,I²C,Microwire,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 1K 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: 管件
45
AT/TSC8x251G2D
4135F–8051–11/06
AC Characteristics - Commercial & Industrial
AC Characteristics - External Bus Cycles
Definition of Symbols
Table 38.
External Bus Cycles Timing Symbol Definitions
Timings
Test conditions: capacitive load on all pins = 50 pF.
Table 39 and Table 40 list the AC timing parameters for the TSC80251G2D derivatives
with no wait states. External wait states can be added by extending PSEN#/RD#/WR#
and or by extending ALE. In these tables, Note 2 marks parameters affected by one ALE
wait state, and Note 3 marks parameters affected by PSEN#/RD#/WR# wait states.
Figure 8 to Figure 13 show the bus cycles with the timing parameters.
Signals
Conditions
A
Address
H
High
D
Data In
L
Low
L
ALE
V
Valid
Q
Data Out
X
No Longer Valid
R
RD#/PSEN#
Z
Floating
WWR#
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