EM78P153EN EMC [ELAN Microelectronics Corp], EM78P153EN Datasheet - Page 24

• Manufacturer Part Number: EM78P153EN
• Description: EM78P153E is an 8-bit microprocessor with low-power and high-speed CMOS technology
• Manufacturer: EMC [ELAN Microelectronics Corp]

This specification is subject to change without prior notice.
2. Crystal Oscillator/Ceramic Resonators(XTAL)
Table 7 The Summary of Maximum Operating Speeds
EM78P153E can be driven by an external clock signal through the OSCI pin as shown in Fig. 12.
In most applications, pin OSCI and pin OSCO can be connected with a crystal or ceramic resonator to
generate oscillation. Fig. 13 depicts such circuit. The same thing applies whether it is in the HXT
mode or in the LXT mode. Table 8 provides the recommended values of C1 and C2. Since each
resonator has its own attribute, user should refer to its specification for appropriate values of C1 and
C2. RS, a serial resistor, may be necessary for AT strip cut crystal or low frequency mode.
Two cycles with two clocks
Conditions
EM78P153E
EM78P153E
Fig. 12 Circuit for External Clock Input
Fig. 13 Circuit for Crystal/Resonator
OSCO
OSCI
OSCO
OSCI
XTAL
RS
VDD
24
2.3
3.0
5.0
C1
C2
Fxt max.(MHz)
Ext. Clock
20.0
4.0
8.0
EM78P153E
OTP ROM
2002/03/01