參數(shù)資料
型號： AT89LP428-20PU
廠商： Atmel
文件頁數(shù)： 27/149頁
文件大?。?/td> 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/復(fù)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(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-DIP（0.300"，7.62mm）
包裝： 管件
122
3654A–MICRO–8/09
AT89LP428/828
23.8
User Signature and Analog Configuration
The User Signature Array contains 128 bytes of nonvolatile memory in two 64-byte pages. The
first page of the User Signature Array (0000H - 003FH) is available for serial numbers, firmware
revision information, date codes or other user parameters. The User Signature Array may only
be written by an external device when the User Signature Programming Fuse is enabled. When
the fuse is enabled, Chip Erase will also erase the first page of the array. When the fuse is dis-
abled, the array is not affected by write or erase commands. Programming of the Signature
Array can also be disabled by the Lock Bits. However, reading the signature is always allowed
and the array should not be used to store security sensitive information. The User Signature
Array may be modified during execution through the In-Application Programming interface,
regardless of the state of the User Signature Programming fuse or Lock Bits, provided that the
IAP Fuse is enabled. Note that the address of the User Signature Array, as seen by
the IAP interface, equals the User Signature address plus 128 (0080H - 00FFH instead of
0000H - 007FH).
The second page of the User Signature Array (0040H - 007FH) contains analog configuration
parameters for the AT89LP428/828. Each byte represents a parameter as listed in Table 23-
7 and is preset in the factory. The parameters are read at POR and the device is configured
accordingly. The second page of the array is not affected by Chip Erase. Other bytes in this
page may be used as additional signature space; however, care should be taken to preserve the
parameter values when modifying other bytes.
23.9
Programming Interface Timing
This section details general system timing sequences and constraints for entering or exiting In-
System Programming as well as parameters related to the Serial Peripheral Interface during
ISP. The general timing parameters for the following waveform figures are listed in section “Tim-
23.9.1
Power-up Sequence
Execute this sequence to enter programming mode immediately after power-up. In the RST pin
is disabled or if the ISP Fuse is disabled, this is the only method to enter programming (see
1.
Apply power between VCC and GND pins. RST should remain low.
2.
Wait at least t
PWRUP. and drive SS high.
3.
Wait at least t
SUT for the internal Power-on Reset to complete. The value of tSUT will
depend on the current settings of the device.
4.
Start programming session.
Table 23-7.
Analog Configuration Definitions
Address
Parameter Name
Description
0040H
RC Oscillator Calibration Byte
The RC Calibration Byte controls the frequency of
the internal RC oscillator. The frequency is inversely
proportional to the calibration value such that higher
values result in lower frequencies. A copy of the
factory-set calibration value is stored at location
0008H of the Atmel Signature.
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