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36 EPSON S1C63000 CORE CPU MANUAL
CHAPTER 4: INSTRUCTION SET
Examples:
LDB %EXT,0x15
LDB %XL,0x7D ...Works as "LD %X, 0157D"
LDB %EXT,0xB8
ADD %X,0x4F ...Works as "ADD %X, 0xB84F"
LDB %EXT,0xE6
CMP %X,0xA2 ...Works as "CMP %X, 0x19A2"
∗ 19H = FFH - [EXT] (E6H)
Above examples use the X register, but they work the same even when the Y register is used.
Note: The CMP instruction performs a subtraction with a complement, therefore it is necessary to set the
complement (1’s complement) of the high-order 8-bit data in the EXT register.
EXT register
←
[FFH - High-order 8-bit data]
• 8-bit absolute addressing
The 8-bit absolute addressing is the addressing mode for accessing within the 8-bit address range
from 0000H or FF00H. To enter this mode, write the low-order 8 bits (00H to FFH) of the address to
the EXT register, then execute an indirect addressing instruction which has [%X] or [%Y] as the source
operand or the destination operand. When [%X] is used, the memory from 0000H to 00FFH can be
accessed, and when [%Y] is used, FF00H to FFFFH can be accessed.
Instructions that operate in the 8-bit absolute addressing mode with the E flag
Instruction Operand
LD %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
EX %r,[%X] %r,[%Y]
ADD %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
ADC %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
%B,[%X],n4 %B,[%Y],n4 [%X],%B,n4 [%Y],%B,n4
[%X],0,n4 [%Y],0,n4
SUB %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
SBC %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
%B,[%X],n4 %B,[%Y],n4 [%X],%B,n4 [%Y],%B,n4
[%X],0,n4 [%Y],0,n4
INC [%X],n4 [%Y],n4
DEC [%X],n4 [%Y],n4
CMP %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
AND %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
OR %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
XOR %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
BIT %r,[%X] %r,[%Y] [%X],%r [%Y],%r [%X],imm4 [%Y],imm4
SLL [%X] [%Y]
SRL [%X] [%Y]
RL [%X] [%Y]
RR [%X] [%Y]
∗ "r" indicates the A or B register. Instructions with an operand other than above or the post-incre-
ment function do not have the extended addressing function.
Examples:
LDB %EXT,0x37
LD %A,[%X] ...Works as "LD %A, [0x0037]"
LDB %EXT,0x9C
ADD [%Y],5 ...Works as "ADD [0xFF9C]"