4250 Datasheet, PDF (33/59 Pages) Energizer – Industrial Rubber Light

MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
SYMBOL
The symbols shown below are used in the following list of instruction function and the machine instructions.
Symbol
Contents
Symbol
Contents
A
Register A (4 bits)
D
Port D (4 bits)
B
Register B (4 bits)
F
Port F (2 bits)
DR
Register D (3 bits)
G
Port G (4 bits)
E
Register E (8 bits)
S
Port S (4 bits)
V1
Timer control register V1 (4 bits)
K
Port K (1 bit)
K0
Key-on wakeup control register K0 (4 bits)
C
Port C (1 bit)
PU0
Pull-up control register PU0 (2 bits)
LO
Logic operation selection register LO (2 bits)
x
Hexadecimal variable
y
Hexadecimal variable
X
Register X (2 bits)
p
Hexadecimal variable
Y
Register Y (4 bits)
n
Hexadecimal constant which represents the
DP
Data pointer (6 bits)
immediate value
(It consists of registers X and Y)
j
Hexadecimal constant which represents the
PC
Program counter (11 bits)
immediate value
PCH
High-order 4 bits of program counter
A3A2A1A0 Binary notation of hexadecimal variable A
PCL
Low-order 7 bits of program counter
SK
Stack register (11 bits ! 4)
(same for others)
SP
Stack pointer (2 bits)
←
Direction of data movement
CY
Carry flag
↔
Data exchange between a register and memory
R1
Timer 1 reload register
?
Decision of state shown before “?”
T1
Timer 1
()
Contents of registers and memories
T1F
Timer 1 interrupt request flag
—
Negate, Flag unchanged after executing
INTE
Interrupt enable flag
instruction
EXF0
External interrupt request flag
M(DP)
RAM address pointed by the data pointer
P
Power down flag
a
Label indicating address a6 a5 a4 a3 a2 a1 a0
p, a
Label indicating address a6 a5 a4 a3 a2 a1 a0
in page p3 p2 p1 p0
C
Hex. C + Hex. number x (also same for others)
+
x
Note : The 4250 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.
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