參數(shù)資料
型號: AT89LP52-20AU
廠商: Atmel
文件頁數(shù): 23/117頁
文件大?。?/td> 0K
描述: IC MCU 8051 8K FLASH SPI 44TQFP
標準包裝: 160
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: EBI/EMI,I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 36
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
13
3709D–MICRO–12/11
AT89LP51/52
Figure 3-3.
External Program Memory Fetches
In order for Fast mode to fetch externally, two wait states must be inserted for every clock cycle,
increasing the instruction execution time by a factor of 3. However, due to other optimizations,
external Fast mode instructions may still be 1/4 to 1/2 faster than their Compatibility mode equiv-
alents. Note that if ALE is allowed to toggle in Fast mode, there is a possibility that when the
CPU jumps from internal to external execution a short pulse may occur on ALE as shown in Fig-
ure 3-4. The setup time from the address to the falling edge of ALE remains the same. However,
this behavior can be avoided by setting the DISALE bit prior to any jump above the 8K border.
Figure 3-4.
Internal/External Program Memory Boundary (Fast Mode)
3.1.2
SIG
In addition to the 64K code space, the AT89LP51/52 also supports a 256-byte User Signature
Array and a 128-byte Atmel Signature Array that are accessible by the CPU. The Atmel Signa-
ture Array is initialized with the Device ID in the factory. The User Signature Array is available for
user identification codes or constant parameter data. Data stored in the signature array is not
secure. Security bits will disable writes to the array; however, reads by an external device pro-
grammer are always allowed.
In order to read from the signature arrays, the SIGEN bit (AUXR1.3) must be set (See Table 5-3
on page 28). While SIGEN is one, MOVC A,@A+DPTR will access the signature arrays. The
User Signature Array is mapped from addresses 0100h to 01FFh and the Atmel Signature Array
is mapped from addresses 0000h to 007Fh. SIGEN must be cleared before using MOVC to
CLK
ALE
PSEN
FLOAT
PCL
OUT
P0
PCH OUT
P2
PCH OUT
DATA
SAMPLED
PCL
OUT
PCL
OUT
DATA
SAMPLED
DATA
SAMPLED
CLK
ALE
DISALE=0
PSEN
FLOAT
P0 SFR OUT
P0
P2 SFR OUT
P2
PCH OUT
PCL OUT
DATA
SAMPLED
SHORT
PULSE
ALE
DISALE=1
INTERNAL EXECUTION
EXTERNAL EXECUTION
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