HMS87C1304A Datasheet, PDF (34/70 Pages) Hynix Semiconductor – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

HMS87C1304A/HMS87C1302A
HYUNDAI MicroElectronics
tions. The RC oscillator frequency is a function of the sup-
ply voltage, the external resistor (Rext) and capacitor
(Cext) values, and the operating temperature.
The user needs to take into account variation due to toler-
ance of external R and C components used. Figure 10-4
shows how the RC combination is connected to the
HMS87C1304A or HMS87C1302A.
Vdd
Rext
Xin
Cext
Figure 10-4 RC Oscillator Connections
The oscillator frequency, divided by 4, is output from the
Xout pin, and can be used for test purpose or to synchroze
other logic.
To set the RC oscillation, it should be programmed
RCOPT bit to "1" to CONFIG (0FF0_H). ( Refer to DE-
VICE CONFIGURATION AREA )
fxin÷4
Xout
Preliminary
34
Preliminary
Jan. 2001