EM78P350N
8-Bit Microprocessor with OTP ROM
6.17 Instruction Set
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 time periods), unless the program counter
is changed by instructions "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," etc.). In this case,
these instructions need one or two instruction cycles as determined by Code Option
Register CYES bit.
In addition, the instruction set has the following features:
1. Every bit of any register can be set, cleared, or tested directly.
2. The I/O registers can be regarded as general registers. That is, the same
instruction can operate on I/O registers.
Convention:
R = Register designator that specifies which one of the registers (including operation and general purpose
registers) is to be utilized by the instruction.
b = Bit field designator that selects the value for the bit located in the register R and which affects the
operation.
k = 8 or 10-bit constant or literal value
Status
Binary Instruction
HEX
Mnemonic
Operation
No Operation
Affected
None
C
0 0000 0000 0000
0 0000 0000 0001
0 0000 0000 0010
0 0000 0000 0011
0 0000 0000 0100
0 0000 0000 rrrr
0 0000 0001 0000
0 0000 0001 0001
0 0000 0001 0010
0 0000 0001 0011
0 0000 0001 0100
0 0000 0001 rrrr
0 0000 01rr rrrr
0 0000 1000 0000
0 0000 11rr rrrr
0 0001 00rr rrrr
0 0001 01rr rrrr
0 0001 10rr rrrr
0 0001 11rr rrrr
0000
0001
0002
0003
0004
000r
0010
0011
0012
0013
0014
001r
00rr
NOP
DAA
Decimal Adjust A
A → CONT
CONTW
SLEP
WDTC
IOW R
ENI
None
T, P
0 → WDT, Stop oscillator
0 → WDT
T, P
A → IOCR
None1
None
None
None
Enable Interrupt
Disable Interrupt
[Top of Stack] → PC
DISI
RET
RETI
[Top of Stack] → PC, Enable Interrupt None
CONTR
IOR R
CONT → A
IOCR → A
None
None1
None
Z
MOV R,A A → R
0080
00rr
CLRA
0 → A
0 → R
CLR R
Z
01rr
SUB A,R R-A → A
SUB R,A R-A → R
Z,C, DC
Z,C, DC
Z
01rr
01rr
DECA R
DEC R
R-1 → A
R-1 → R
01rr
Z
88 •
Product Specification (V1.0) 09.14.2006
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
