GMS87C1102 Datasheet, PDF (38/80 Pages) Hynix Semiconductor – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

GMS87C1102 / GMS87C1202
HYUNDAI MicroElectronics
Vdd
Rext
Cext
fxin÷4
Xin
Xout
Figure 13-4 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 )
Note: When using a system clock oscillator, carry out wir-
ing in the broken line area in Figure 13-2 to prevent
any effects from wiring capacities.
- Minimize the wiring length.
- Do not allow wiring to intersect with other signal
conductors.
- Do not allow wiring to come near changing
high current.
- Set the potential of the grounding position of the os-
cillator capacitor to that of VSS. Do not ground to
any ground pattern where high current is
present.
- Do not fetch signals from the oscillator.
38
Oct. 1999 ver 1.0