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參數(shù)資料
| 型號(hào)： | AT89LP428-20PU |
| 廠商： | Atmel |
| 文件頁(yè)數(shù)： | 63/149頁(yè) |
| 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 |
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20
3654A–MICRO–8/09
AT89LP428/828
5.2
Restrictions on Certain Instructions
The AT89LP428/828 is an economical and cost-effective member of Atmel's growing family of
microcontrollers. It contains 4K/8K bytes of Flash program memory. It is fully compatible with the
MCS-51 architecture, and can be programmed using the MCS-51 instruction set. However,
there are a few considerations one must keep in mind when utilizing certain instructions to pro-
gram this device. All the instructions related to jumping or branching should be restricted such
that the destination address falls within the physical program memory space of the device, which
is 0000H–0FFFH for the AT89LP428 and 0000H–1FFFH for the AT89LP828. This should bethe
responsibility of the software programmer. For example, LJMP 07E0H would be a valid instruc-
tion, whereas LJMP 9000H would not. A typical 8051 assembler will still assemble instructions,
even if they are written in violation of the restrictions mentioned above. It is the responsibility of
the user to know the physical features and limitations of the device being used and to adjust the
instructions used accordingly.
5.2.1
Branching Instructions
The LCALL, LJMP, ACALL, AJMP, SJMP, and JMP @A+DPTR unconditional branching instruc-
tions will execute correctly as long as the programmer keeps in mind that the destination
branching address must fall within the physical boundaries of the program memory size. Violat-
ing the physical space limits may cause unknown program behavior. With the CJNE [...], DJNZ
[...], JB, JNB, JC, JNC, JBC, JZ, and JNZ conditional branching instructions, the same previous
rule applies. Again, violating the memory boundaries may cause erratic execution.
5.2.2
MOVX-related Instructions
The AT89LP428/828 contains 512 bytes of internal Extra RAM and 512/1024 bytes of Flash
data memory mapped into the XRAM address space. MOVX accesses to addresses above
03FFH/05FFH will return invalid data.
6.
System Clock
The system clock is generated directly from one of three selectable clock sources. The three
sources are the on-chip crystal oscillator, external clock source, and internal RC oscillator. The
on-chip crystal oscillator may also be configured for low and high speed operation. The clock
source is selected by the Clock Source User Fuses as shown in Table 6-1. See “User Configura-
tion Fuses” on page 121. By default, no internal clock division is used to generate the CPU clock
from the system clock. However, the system clock divider may be used to prescale the system
clock. The choice of clock source also affects the start-up time after a POR, BOD or Power-
down event (see “Reset” on page 23 or “Power-down Mode” on page 27).
Table 6-1.
Clock Source Settings
Clock Source
Fuse 1
Clock Source
Fuse 0
Selected Clock Source
0
High Speed Crystal Oscillator (f > 500 kHz)
01
Low Speed Crystal Oscillator (f
≤100 kHz)
10
External Clock on XTAL1
1
Internal 8 MHz RC Oscillator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT89LP51-20AU | 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT |
| AT89LP51-20JU | 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT |
| AT89LP51-20MU | 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT |
| AT89LP51-20PU | 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT |
| AT89LP51ED2-20AAU | 功能描述:8位微控制器 -MCU 64KB 20MHz 2.4V-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT |
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