參數(shù)資料
型號: AT87C58X2-SLRUM
廠商: Atmel
文件頁數(shù): 62/62頁
文件大?。?/td> 0K
描述: MCU 8051 32K EPROM 44PLCC
標(biāo)準(zhǔn)包裝: 500
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,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: 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: 44-LCC(J 形引線)
包裝: 帶卷 (TR)
9
4431E–8051–04/06
AT/TS8xC54/8X2
Figure 6-2.
Mode Switching Waveforms
The X2 bit in the CKCON register (See Table 6-1.) 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).
CAUTION
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 refer-
ence 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.
XTAL1:2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
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