參數(shù)資料
型號: AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 21/149頁
文件大?。?/td> 0K
描述: MCU 8051 4K FLASH SPI 28PDIP
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 14
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 768 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: 28-DIP(0.300",7.62mm)
包裝: 管件
117
3654A–MICRO–8/09
AT89LP428/828
Figure 23-2. AT89LP428/828 Memory Organization
23.3
Command Format
Programming commands consist of an opcode byte, two address bytes, and zero or more data
bytes. In addition, all command packets must start with a two-byte preamble of AAH and 55H.
The preamble increases the noise immunity of the programming interface by making it more dif-
ficult to issue unintentional commands. Figure 23-3 on page 118 shows a simplified flow chart of
a command sequence.
A sample command packet is shown in Figure 23-4 on page 118. The SS pin defines the packet
frame. SS must be brought low before the first byte in a command is sent and brought back high
after the final byte in the command has been sent. The command is not complete until SS
returns high. Command bytes are issued serially on MOSI. Data output bytes are received seri-
ally on MISO. Packets of variable length are supported by returning SS high when the final
required byte has been transmitted. In some cases command bytes have a don’t care value.
Don’t care bytes in the middle of a packet must be transmitted. Don’t care bytes at the end of a
packet may be ignored.
Page-oriented instructions always include a full 16-bit address. The higher order bits select the
page and the lower order bits select the byte within that page. The AT89LP428/828 allocates
6 bits for byte address and 7 bits for page address. The page to be accessed is always fixed by
the page address as transmitted. The byte address specifies the starting address for the first
Table 23-2.
Data Memory Size
Device #
Data Size
Page Size
# Pages
Address Range
AT89LP428
512 bytes
64 bytes
8
0200H - 03FFH
AT89LP828
1024 bytes
64 bytes
16
0200H - 05FFH
Page 0
Page 1
Page 127
Page 126
Page 0
User Fuse Row
User Signature Array
Atmel Signature Array
Code Memory
Page 1
00
3F
0000
1FFF
Page 0
Page 15
0200
05FF
Data Memory
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