Epson S1C63000 LDB %BA,[%ir]+, LDB %BA,%EXT, Code:, Mode:, Code:, Mode:, Flags:, Flags:, 1 cycle, 2 cycles, Function: A ←, Function: BA ←, Load EXT reg. into BA reg

CHAPTER 4: INSTRUCTION SET

LDB %BA,[%ir]+				Load location [ir reg.] into BA reg. and increment ir reg.																	2 cycles
Function: A ←		[ir], B ←		[ir + 1], ir ←			ir + 2
	Loads the 2-word data in the data memory into the BA register. The content of the data
	memory addressed by the ir register (X or Y) is loaded into the A register as the low-order 4
	bits, and the content of the next address is loaded into the B register as the high-order 4 bits.
	The ir register (X or Y) is incremented by 2 words.
Code:	Mnemonic				MSB													LSB
	LDB %BA,[%X]+					1	1	1	1	1	1	1	0	1	1	0	0		0	1FD8H
	LDB %BA,[%Y]+					1	1	1	1	1	1	1	0	1	1	0	1		0	1FDAH
Flags:	E		I	C		Z
	↓		–	–		–
Mode:	Src: Register indirect
	Dst: Register direct
	Extended addressing: Invalid

LDB %BA,%EXT

Load EXT reg. into BA reg.

1 cycle

Function: BA ←

EXT

Loads the content of the EXT register into the BA register.

Code:

Mnemonic

MSB

LSB

LDB %BA,%EXT

1

1

1

1

1

1

1

0

1

0

1

1

X

1FD6H, (1FD7H)

Flags:

E

I

C

Z

↓

–

–

–

Mode:

Src: Register direct

Dst: Register direct

Extended addressing: Invalid

106 EPSON S1C63000 CORE CPU MANUAL