參數(shù)資料
型號: AT89LP52-20PU
廠商: Atmel
文件頁數(shù): 22/117頁
文件大小: 0K
描述: IC MCU 8051 8K FLASH SPI 40PDIP
標準包裝: 10
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: 40-DIP(0.600",15.24mm)
包裝: 管件
12
3709D–MICRO–12/11
AT89LP51/52
Figure 3-1.
Program Memory Map
3.1.1
External Program Memory Interface
The AT89LP51/52 uses the standard 8051 external program memory interface with the upper
address on Port 2, the lower address and data in/out multiplexed on Port 0, and the ALE and
PSEN strobes. Program memory addresses are always 16-bits wide, even though the actual
amount of program memory used may be less than 64K byes. External program execution sacri-
fices two full 8-bit ports, P0 and P2, to the function of addressing the program memory.
Figure 3-2 shows a hardware configuration for accessing up to 64K bytes of external ROM using
a 16-bit linear address. Port 0 serves as a multiplexed address/data bus to the ROM. The
Address Latch Enable strobe (ALE) is used to latch the lower address byte into an external reg-
ister so that Port 0 can be freed for data input/output. Port 2 provides the upper address byte
throughout the operation. PSEN strobes the external memory.
Figure 3-3 shows the timing of the external program memory interface. ALE is emitted at a con-
stant rate of 1/3 of the system clock with a 1/3 duty cycle. PSEN is emitted at a similar rate, but
with 50% duty cycle. The new address changes in the middle of the ALE pulse for latching on
the falling edge and is tristated at the falling edge of PSEN. The instruction data is sampled from
P0 and latched internally during the high phase of the clock prior to the rising edge of PSEN.
This timing applies to both Compatibility and Fast modes. In Compatibility mode there is no dif-
ference in instruction timing between internal and external execution.
Figure 3-2.
Executing from External Program Memory
0000
FFFF
0000
007F
User Signature Array
0100
01FF
Atmel Signature Array
SIGEN=0
SIGEN=1
AT89LP52
2000
1FFF
External Program
Memory
(XCODE: 56KB)
Internal Program
Memory
(CODE: 8KB)
0000
FFFF
0000
007F
User Signature Array
0100
01FF
Atmel Signature Array
AT89LP51
1000
0FFF
External Program
Memory
(XCODE: 60KB)
Internal Program
Memory
(CODE: 4KB)
AT89LP
EXTERNAL
PROGRAM
MEMORY
INSTR.
ADDR
OE
PSEN
P3
P2
ALE
P0
P1
LATCH
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