45111 datasheet(132/184 Pages) ETC2

132 / 184 page

13 Appendix C: SX Instruction Set

Page 132

• SX-Key/Blitz Development System Manual 2.0 • Parallax, Inc.

IREAD

Read instruction at MODE:W into MODE:W

Command

Words

Cycles

Affects

Coding

1) IREAD

4 (16)

MODE, W

0000 0100 0001 IREAD

Operation: The instruction or value at the 12-bit location MODE:W is read and stored into the MODE:W bits. This

instruction can be used to read values in tables created with the DW directive. Use the MODE and MOV

instructions to read and write from the mode register.

src_bit, addr9

Jump if src_bit is set

Command

Words

Cycles

Affects

Coding

1) JB

op.bit, addr9

2 or 4 (jump)

(8 or 12)

0110 bbbf ffff SNB op.bit

101k kkkk kkkk JMP addr9

Operation: If src_bit is set, a jump to addr9 is executed.

addr9

Jump if carry

Command

Words

Cycles

Affects

Coding

1) JC

addr9

2 or 4 (jump)

(8 or 12)

0110 0000 0011 SNC

101k kkkk kkkk JMP addr9

Operation: If the carry flag is set, a jump to addr9 is executed.

JMP

dest

Jump to dest

Command

Words

Cycles

Affects

Coding

1) JMP

addr9

3 (8)

101k kkkk kkkk JMP addr9

2) JMP

3 (8)

0000 001f ffff JMP w

3) JMP

PC+W

3 (8)

PC, C, DC, Z

0001 111f ffff ADD PC, W

Operation: Jump to address in dest. The lower 9 bits of the literal addr9 are moved into the program counter in

command #1. W is moved into the program counter in command #2. W+1 is added to the program

counter in command #3. Bit 9 of the program counter is cleared in command #2 and #3, so the jump

destination will be in the first 256 words of any 512-word page. This instruction is useful for jumping

into lookup tables comprised of RETW instructions, or jumping to particular routines. The flags are set

as in an ADD instruction for command #3. If CARRYX is specified, c affects the result of command #3. Insert

a CLC before command #3 to avoid strange results.

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