45111 datasheet(124/184 Pages) ETC2

124 / 184 page

13 Appendix C: SX Instruction Set

Page 124

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

BANK

dest

Set bank select bits

Command

Words

Cycles

Affects

Coding

BANK

1 (4)

FSR

0000 0001 1fff BANK fr

Operation: Writes file registers bits 7 through 5 (on the SX20/28) or 6 through 4 (on the SX48/52) to the same bits in

the file select register (FSR) in preparation for a RAM access across a bank boundary. The full 8-bit file

upper and lower block of banks. This bit is not affected by the BANK instruction, and must be set or cleared with a

separate SETB FSR.7 or CLRB FSR.7 following the BANK instruction.

CALL

addr8

Call subroutine with 8-bit address

Command

Words

Cycles

Affects

Coding

1) CALL

addr8

3 (8)

1001 kkkk kkkk CALL addr8

Operation: The next instruction address is pushed onto the stack and addr8 is moved to the program counter. The

ninth bit of the program counter will be cleared to 0. Therefore, calls are only allowed to the first half of

any 512-word page, although the CALL instruction can be anywhere.

CJA

op1, op2, addr9

Compare op1 to op2 and jump if above

Command

Words

Cycles

Affects

Coding

1) CJA

fr, #literal, addr

4 or 6 (jump)

(16 or 20)

W, C, DC, Z

1100 kkkk kkkk MOV W, #lit^$FF

0001 110f ffff ADD W, fr

0110 0000 0011 SNC

101k kkkk kkkk JMP addr9

2) CJA

fr1, fr2, addr

4 or 6 (jump)

(16 or 20)

W, C, DC, Z

0010 000f ffff MOV W, fr1

0000 100f ffff MOV W, fr2-W

0111 0000 0011 SC

101k kkkk kkkk JMP addr9

Operation: op1 is compared to op2. If op1 is greater than op2, a jump to addr9 is executed. W is left holding the

result of op1 + ~op2 in command #1 and op2 - op1 in command #2. If CARRYX is specified, c affects the

result. Insert a CLC before command #1 and an STC before command #2 to avoid strange results.

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