参数资料
型号: AT80251G2D-SLSUM
厂商: Atmel
文件页数: 44/77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
49
AT/TSC8x251G2D
4135F–8051–11/06
Figure 10.
External Bus Cycle: Data Write (Non-Page Mode)
Note:
1. The value of this parameter depends on wait states. See Table 39 and Table 40.
Waveforms in Page Mode
Figure 11.
External Bus Cycle: Code Fetch (Page Mode)
Note:
1. The value of this parameter depends on wait states. See Table 39 and Table 40.
2. A page hit (i.e., a code fetch to the same 256-byte “page” as the previous code fetch)
requires one state (2TOSC);
a page miss requires two states (4TOSC).
3. During a sequence of page hits, PSEN# remains low until the end of the last page-hit
cycle.
T
WHLH
TAVWL2
(1)
TAVWL1
(1)
TLHAX
(1)
TLLAX
TWHQX
TWHAX
P2/A16/A17
P0
WR#
ALE
TLHLL(1)
TWLWH(1)
Data Out
A15:8/A16/A17
TAVLL(1)
TQVWH
A7:0
D7:0
TLLAX
TAVDV2
(1)
TAVDV1(1)
TLHAX(1)
TAVRL(1)
TRHDZ1
TRLAZ
TAXDX
TAVDV3(1)
P0/A16/A17
P2
PSEN#(3)
ALE
TLHLL(1)
A7:0/A16/A17
TAVLL(1)
TLLRL(1)
TRLDV(1)
Page Miss(2)
Page Hit(2)
TRHAX
A7:0/A16/A17
D7:0
A15:8
Instruction In
TRHDX
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