參數(shù)資料
型號(hào): AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 19/149頁
文件大小: 0K
描述: MCU 8051 4K FLASH SPI 28PDIP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)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(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲(chǔ)器容量: 4KB(4K x 8)
程序存儲(chǔ)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(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
115
3654A–MICRO–8/09
AT89LP428/828
23. Programming the Flash Memory
The Atmel AT89LP428/828 microcontroller features 4K/8K bytes of on-chip In-System Program-
mable Flash program memory and 512/1024 bytes of nonvolatile Flash data memory. In-System
Programming allows programming and reprogramming of the microcontroller positioned inside
the end system. Using a simple 4-wire SPI interface, the programmer communicates serially
with the AT89LP428/828 microcontroller, reprogramming all nonvolatile memories on the chip.
In-System Programming eliminates the need for physical removal of the chips from the system.
This will save time and money, both during development in the lab, and when updating the soft-
ware or parameters in the field. The programming interface of the AT89LP428/828 includes the
following features:
4-wire SPI Programming Interface
Active-low Reset Entry into Programming
Slave Select Allows Multiple Devices on Same Interface
User Signature Array
Flexible Page Programming
Row Erase Capability
Page Write with Auto-Erase Commands
Programming Status Register
For more detailed information on In-System Programming, refer to the Application Note entitled
“AT89LP In-System Programming Specification”.
23.1
Physical Interface
Flash Programming utilizes the Serial Peripheral Interface (SPI) pins of an AT89LP428/828
microcontroller. The SPI is a full-duplex synchronous serial interface consisting of four wires:
Serial Clock (SCK), Master-in/Slave-out (MISO), Master-out/Slave-in (MOSI), and an active-low
Slave Select (SS). When programming an AT89LP428/828 device, the programmer always
operates as the SPI master, and the target system always operates as the SPI slave. To enter or
remain in Programming mode the device’s reset line (RST) must be held active (low). With the
addition of VCC and GND, an AT89LP428/828 microcontroller can be programmed with a mini-
mum of seven connections as shown in Figure 23-1.
Figure 23-1. In-System Programming Device Connections
AT89LP428/LP828
VCC
P3.6/RST
P1.7/SCK
P1.5/MOSI
GND
Serial Clock
Serial In
RST
P1.4/SS
P1.6/MISO
Serial Out
SS
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