Megawin Technology Co., Ltd.
MG87FE/L52
13 System Oscillator
13.1 External crystal mode
MG87FE/L52 built-in two kinds of oscillator for MCU system clock operating. The first one is
crystal oscillator & it can support 6MHz ~ 48MHz/12T or 6MHz ~ 24MHz/6T with external crystal
component. Please refer to the figure 13-1.
VDD=5/3V
XTL
6MHz 30p/15p
11.059MHz
C1
C2
R1 (ohm)
NC
1
2
3
4
5
6
7
8
30p/15p
NC
20p/10p
12p/7p
20p/10p
12p/7p
12MHz
22.118MHz
24MHz
NC
NC
NC
24.576MHz
26~30MHz
31~35MHz
NC
8p/8p
8p/8p
8p/8p
8p/8p
6.8K
5.1K
13.2 Internal RC-oscillator
MG87FE/L52 had special designed & built-in internal RC-oscillator with frequency drifts that
just under 4%. The operating temperature range is between -40 ~ 85°C & under its operating
voltage is 4.5V ~ 5.5V or 2.7V ~ 3.6V. By the way, user could save an external crystal & just
keep XTAL1 & XTAL2 pins at floating status.
The internal oscillator could support 6MHz, 11.059MHz, 12MHz, 22.118MHz, 24MHz &
24.576MHz. User can select & trim requested frequency from Megawin programming tool
“8051writer U1”.
36
Preliminary ver 1.3
Date: 2009-JAN-20
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
