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| 型號： | AT87251G2D-3CSUM |
| 廠商： | Atmel |
| 文件頁數(shù)： | 14/77頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 8051 MCU 32K OTP 24MHZ 40DIP |
| 標(biāo)準(zhǔn)包裝： | 216 |
| 系列： | 8x251 |
| 核心處理器： | C251 |
| 芯體尺寸： | 8/16-位 |
| 速度： | 24MHz |
| 連通性： | EBI/EMI，I²C，Microwire，SPI，UART/USART |
| 外圍設(shè)備： | POR，PWM，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器容量： | 32KB（32K x 8） |
| 程序存儲器類型： | OTP |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 40-DIP（0.600"，15.24mm） |
| 包裝： | 管件 |
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21
AT/TSC8x251G2D
4135F–8051–11/06
Instruction Set
Summary
This section contains tables that summarize the instruction set. For each instruction
there is a short description, its length in bytes, and its execution time in states (one state
time is equal to two system clock cycles). There are two concurrent processes limiting
the effective instruction throughput:
Instruction Fetch
Instruction Execution
fetching 16-bit at a time and this is never limiting the execution speed.
If the code is fetched from external memory, a pre-fetch queue will store instructions
ahead of execution to optimize the memory bandwidth usage when slower instructions
are executed. However, the effective speed may be limited depending on the average
size of instructions (for the considered section of the program flow). The maximum aver-
age instruction throughput is provided by Table 14 depending on the external memory
configuration (from Page Mode to Non-Page Mode and the maximum number of wait
states). If the average size of instructions is not an integer, the maximum effective
throughput is found by pondering the number of states for the neighbor integer values.
Table 14.
Minimum Number of States per Instruction for given Average Sizes
If the average execution time of the considered instructions is larger than the number of
states given by Table 14, this larger value will prevail as the limiting factor. Otherwise,
the value from Table 14 must be taken. This is providing a fair estimation of the execu-
tion speed but only the actual code execution can provide the final value.
Notation for Instruction
Operands
Table 15.
Notation for Direct Addressing
Average size
of Instructions
(bytes)
Page Mode
(states)
Non-page Mode (states)
0 Wait
State
1 Wait
State
2 Wait States 3 Wait States 4 Wait States
11
2
3
4
5
6
22
4
6
8
10
12
3
6
9
12
15
18
44
8
12
16
20
24
5
10
15
20
25
30
Direct
Address
Description
C251
C51
dir8
A direct 8-bit address. This can be a memory address (00h-7Fh) or a
SFR address (80h-FFh). It is a byte (default), word or double word
depending on the other operand.
33
dir16
A 16-bit memory address (00:0000h-00:FFFFh) used in direct
addressing.
3–
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT87251G2D-RLTUL | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:B/16-BIT MICROCONTROLLER WITH SERIAL COMMUNICATION INTERFACES |
| AT87251G2D-RLTUM | 功能描述:8位微控制器 -MCU 251G2D 8/16bitC OTP 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| AT87251G2D-SLSUL | 功能描述:8位微控制器 -MCU Microcontroller 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| AT87251G2D-SLSUM | 功能描述:8位微控制器 -MCU OTP 8/16bit St 5V 24MHz 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| AT875 | 制造商:POSEICO 制造商全稱:POSEICO 功能描述:PHASE CONTROL THYRISTOR |
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