Instruction list, Symbols in the instruction list – Epson S5U1C62000A User Manual
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Instruction List (1)
S1C6200 Core CPU
Symbols in the Instruction List
Registers/Register Data
A:
Data register A or its contents (4 bits)
B:
Data register B or its contents (4 bits)
X:
Register XHL or its contents (8 low-order bits of the IX register)
XP:
Register XP or its contents (4 high-order bits of the IX register)
XH:
Register XH or its contents (4 high-order bits of the XHL register)
XL:
Register XL or its contents (4 low-order bits of the XHL register)
Y:
Register YHL or its contents (8 low-order bits of the IY register)
YP:
Register YP or its contents (4 high-order bits of the IY register)
YH:
Register YH or its contents (4 high-order bits of the YHL register)
YL:
Register YL or its contents (4 low-order bits of the YHL register)
F:
Flag register F or its contents (4 bits)
SP:
Stack pointer SP or its contents (8 bits)
SPH:
Stack pointer SPH or its contents (4 high-order bits of the stack pointer)
SPL:
Stack pointer SPL or its contents (4 low-order bits of the stack pointer)
NBP:
New bank pointer NBP or its contents (1 bit)
NPP:
New page pointer NPP or its contents (4 bits)
PCB:
Program counter bank PCB or its contents (1 bit)
PCP:
Program counter page PCP or its contents (4 bits)
PCS:
Program counter step PCS or its contents (8 bits)
PCSH:
4 high-order bits of PCS (4 bits)
PCSL:
4 low-order bits of PCS (4 bits)
Memory/Addresses/Memory Data
MX, M(X):
Data memory addressed by IX or the contents of the specified memory
MY, M(Y):
Data memory addressed by IY or the contents of the specified memory
Mn, M(n):
Data memory addressed by n (n = 0 to 0xf) or the contents of the specified memory
M(SP):
Stack addressed by SP or the contents of the stack address
Immediate Data
p:
5-bit immediate data or a label (0x0–0x1f)
s:
8-bit immediate data or a label (0x0–0xff)
l, x, y:
8-bit immediate data (0x0–0xff)
i:
4-bit immediate data (0x0–0xf)
n:
4-bit address for specifying Mn (0x0–0xf)
r, q:
2-bit immediate data for specifying a register or a data memory
Functions
←
:
Indicates that the right item is loaded or set to the left item.
+:
Addition
-:
Subtraction
&:
AND
|:
OR
^:
XOR
!:
NOT
Flags
Z:
Zero flag
C:
Carry flag
I:
Interrupt flag
D:
Decimal flag
–:
Not changed
↔
:
Set (1), reset (0) or not changed
1:
Set (1)
0:
Reset (0)
★
:
Indicates that the instruction performs a decimal operation if the D flag is set.
Clk
Indicates the number of execution cycles.
r
r1
0
0
1
1
r0
0
1
0
1
q
q1
0
0
1
1
q0
0
1
0
1
Register/memory
specified
A
B
MX
MY