CHAPTER 4: INSTRUCTION SET

CALR [addr6]

 

 

Call subroutine at relative location [addr6]

2 cycles

Function: ([(SP1-1)*4+3]~[(SP1-1)*4]) ←

PC + 1, SP1 ←

SP1 - 1, PC ← PC + [addr6] + 1

 

(addr6 = 0000H–003FH)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Saves the address next to this instruction to the stack as a return address, then adds the content

 

of the data memory (0000H–003FH) specified with the addr6 to that address to unconditionally

 

call the subroutine started from the address. Branch destination range is the next address of

 

this instruction +0 to 15.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Code:

Mnemonic

 

 

MSB

 

 

 

 

 

 

 

 

 

 

LSB

 

 

 

CALR [addr6]

 

1

 

1

1

 

1

1

0

0

 

a5

a4

a3

a2

a1

a0

1F00H–1F3FH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flags:

E

 

I

 

C

 

Z

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

↓

 

–

 

–

 

–

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode:

6-bit absolute

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Extended addressing: Invalid

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CALR sign8

Call subroutine at relative location sign8

 

1 cycle

Function: ([(SP1-1)*4+3]~[(SP1-1)*4]) ←

PC + 1, SP1 ← SP1 - 1, PC ← PC + sign8 + 1 (sign8 = -128~127)

 

Saves the address next to this instruction to the stack as a return address, then adds the related

 

address specified with the sign8 to that address to unconditionally call the subroutine started

 

from the address. Branch destination range is the next address of this instruction -128 to +127.

Code:

Mnemonic

MSB

 

 

 

 

 

 

 

 

 

LSB

 

 

 

CALR sign8

 

 

0

 

0

 

0

1

0

s7

s6

s5

s4

s3

s2

s1

s0

0200H–02FFH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flags:

E

I

C

 

Z

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

↓

–

–

 

–

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode:

Signed 8-bit PC relative

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Extended addressing: Valid

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Extended

LDB

%EXT,imm8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

operation: CALR sign8

 

 

([(SP1-1)∗4+3]~[(SP1-1)∗4]) ← PC + 1, SP1 ←

SP1 - 1,

 

 

 

 

 

PC ← PC + sign16 + 1

 

 

(sign16 = -32768 to 32767, upper 8-bit: imm8, lower 8-bit: sign8)

82

EPSON

S1C63000 CORE CPU MANUAL