參數(shù)資料
型號: AT87C52X2-3CSUM
廠商: Atmel
文件頁數(shù): 55/55頁
文件大?。?/td> 0K
描述: IC 8051 MCU 8K OTP 40MHZ 40DIP
標準包裝: 216
系列: 87C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40/20MHz
連通性: UART/USART
外圍設(shè)備: POR
輸入/輸出數(shù): 32
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: OTP
RAM 容量: 256 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
9
TS8xCx2X2
4184I–8051–02/08
Figure 2. Mode Switching Waveforms
The X2 bit in the CKCON register (See Table 3.) allows to switch from 12 clock cycles
per instruction to 6 clock cycles and vice versa. At reset, the standard speed is activated
(STD mode). Setting this bit activates the X2 feature (X2 mode).
Note:
In order to prevent any incorrect operation while operating in X2 mode, user must be
aware that all peripherals using clock frequency as time reference (UART, timers) will
have their time reference divided by two. For example a free running timer generating an
interrupt every 20 ms will then generate an interrupt every 10 ms. UART with 4800 baud
rate will have 9600 baud rate.
Table 3. CKCON Register
CKCON - Clock Control Register (8Fh)
Reset Value = XXXX XXX0b
Not bit addressable
For further details on the X2 feature, please refer to ANM072 available on the web
(http://www.atmel.com)
XTAL1:2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
7
6
5
4
3
2
1
0
-
X2
Bit
Number
Bit
Mnemonic Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
X2
CPU and peripheral clock bit
Clear to select 12 clock periods per machine cycle (STD mode, FOSC=FXTAL/2).
Set to select 6 clock periods per machine cycle (X2 mode, FOSC=FXTAL).
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AT87C52X2-RLRUM 功能描述:8位微控制器 -MCU 0.5um 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 安裝風格:SMD/SMT
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AT87C52X2-RLTUV 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller 8 Kbytes ROM/OTP, ROMless