4283 Group
INSTRUCTIONS
The 4283 Group has the 68 instructions. Each instruction is
described as follows;
(1) List of instruction function
(2) Machine instructions (index by alphabet)
(3) Machine instructions (index by function)
(4) Instruction code table
SYMBOL
The symbols shown below are used in the following list of
instruction function and the machine instructions.
Contents
Contents
Symbol
Symbol
Register A (4 bits)
Register B (4 bits)
Register D (3 bits)
Register E (8 bits)
Port D (8 bits)
Port E (3 bits)
Port G (4 bits)
Port CARR (1 bit)
CAR flag (1 bit)
A
D
E
G
B
DR
ER
V1
V2
CARR
CAR
Timer control register V1 (3 bits)
Timer control register V2 (4 bits)
Pull-down control register PU0 (4 bits)
Pull-down control register PU1 (4 bits)
Logic operation selection register LO (2 bits)
Hexadecimal variable
PU0
PU1
LO
x
y
p
n
Hexadecimal variable
Hexadecimal variable
Hexadecimal constant which represents the
immediate value
Register X (2 bits)
X
Register Y (4 bits)
Hexadecimal constant which represents the
immediate value
Y
j
Data pointer (6 bits)
DP
(It consists of registers X and Y)
Program counter (11 bits)
High-order 4 bits of program counter
Low-order 7 bits of program counter
Stack register (11 bits ✕ 4)
Stack pointer (2 bits)
Carry flag
A3A2A1A0
Binary notation of hexadecimal variable A
(same for others)
PC
PCH
PCL
SK
←
↔
?
Direction of data movement
Data exchange between a register and memory
Decision of state shown before “?”
Contents of registers and memories
Negate, Flag unchanged after executing
instruction
SP
( )
—
CY
Timer 1 reload register
Timer 1
R1
T1
Timer 1 underflow flag
Timer 2 reload register
Timer 2 reload register
Timer 2
M(DP)
a
RAM address pointed by the data pointer
Label indicating address a6 a5 a4 a3 a2 a1 a0
Label indicating address a6 a5 a4 a3 a2 a1 a0
in page p3 p2 p1 p0
T1F
R2H
R2L
T2
p, a
Timer 2 underflow flag
Watchdog timer
C
+
x
Hex. number C + Hex. number x (also same for
others)
T2F
WDT
WDF1
WDF2
URS
P
Watchdog timer flag 1
Watchdog timer flag 2
Most significant ROM code reference enable flag
Power down flag
System clock
STCK
INSTCK
Instruction clock
Note : The 4283 Group just invalidates the next instruction when a skip is performed. The contents of program counter is not
increased by 2. Accordingly, the number of cycles does not change even if skip is not performed. However, the cycle count
becomes “1” if the TABP p, RT, or RTS instruction is skipped.
Rev.1.01 Mar 20, 2006 page 25 of 62
REJ03B0109-0101
RENESAS [ RENESAS TECHNOLOGY CORP ]
