參數資料
型號: AT89LP52-20PU
廠商: Atmel
文件頁數: 29/117頁
文件大?。?/td> 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: 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
19
3709D–MICRO–12/11
AT89LP51/52
Figure 3-10. External Data Memory 16-bit Linear Address Mode
Figure 3-11 shows a hardware configuration for accessing 256-byte blocks of external RAM
using an 8-bit paged address. Port 0 serves as a multiplexed address/data bus to the RAM. The
ALE strobe is used to latch the address byte into an external register so that Port 0 can be freed
for data input/output. The Port 2 I/O lines (or other ports) can provide control lines to page the
memory; however, this operation is not handled automatically by hardware. The software appli-
cation must change the Port 2 register when appropriate to access different pages. The
MOVX @Ri instructions use Paged Address mode.
Figure 3-11. External Data Memory 8-bit Paged Address Mode
Note that prior to using the external memory interface, WR (P3.6) and RD (P3.7) must be config-
ured as outputs. See Section 10.1 “Port Configuration” on page 41. P0 and P2 are configured
automatically to push-pull output mode when outputting address or data and P0 is automatically
tristated when inputting data regardless of the port configuration. The Port 0 configuration will
determine the idle state of Port 0 when not accessing the external memory.
Figure 3-12 and Figure 3-13 show examples of external data memory write and read cycles,
respectively. The address on P0 and P2 is stable at the falling edge of ALE. The idle state of
ALE is controlled by DISALE (AUXR.0). When DISALE = 0 the ALE toggles at a constant rate
when not accessing external memory. When DISALE = 1 the ALE is weakly pulled high. DISALE
must be one in order to use P4.4 as a general-purpose I/O. The WS bits in AUXR can extended
the RD and WR strobes by 1, 2 or 3 cycles as shown in Figures 3-16, 3-17 and 3-18. If a longer
strobe is required, the application can scale the system clock with the clock divider to meet the
requirements (See Section 6.4 on page 31).
P1
P0
ALE
P2
RD
P3
WR
AT89LP
DATA
LATCH
EXTERNAL
DATA
MEMORY
WE
ADDR
OE
P1
P0
I/O
ALE
P2
RD
P3
WR
AT89LP
DATA
LATCH
EXTERNAL
DATA
MEMORY
WE
ADDR
PAGE
BITS
OE
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AT89LP6440-20JU 功能描述:8位微控制器 -MCU Single-Cycle 8051 64K ISP Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
AT89LP6440-20MU 功能描述:8位微控制器 -MCU Single-Cycle 8051 64K ISP Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
AT89LP6440-20PU 功能描述:8位微控制器 -MCU Single-Cycle 8051 64K ISP Flash RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
AT89LP828-20AU 功能描述:8位微控制器 -MCU Single Cycle 8051 8K ISP Flash 2.4V-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT