EM78P153EN EMC [ELAN Microelectronics Corp], EM78P153EN Datasheet - Page 31

• 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.
4.13 Instruction Set
on reset. Fig.18 and Fig. 19 show how to build a residue-voltage protection circuit.
Each instruction in the instruction set is a 13-bit word divided into an OP code and one or more
operands. Normally, all instructions are executed within one single instruction cycle (one instruction
consists of 2 oscillator periods), unless the program counter is changed by instruction "MOV R2,A",
"ADD R2,A", or by instructions of arithmetic or logic operation on R2 (e.g. "SUB R2,A", "BS(C) R2,6",
"CLR R2", ). In this case, the execution takes two instruction cycles.
If for some reasons, the specification of the instruction cycle is not suitable for certain applications, try
modifying the instruction as follows:
(A) Modify one instruction cycle to consist of 4 oscillator periods.
E M 7 8 P 1 5 3 E
E M 7 8 P 1 5 3 E
Fig. 18 Circuit 1 for the Residue Voltage Protection
Fig. 19 Circuit 2 for the Residue Voltage Protection
/RESET
/RESET
V d d
V d d
100K
Q1
Q1
R3
31
10K
1N4684
33K
R1
R2
Vdd
Vdd
EM78P153E
OTP ROM
2002/03/01