Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Instrukcja Użytkownika Pobierz pdf (Strona 37)

5 INSTRUCTION SET

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

Extending the displacement of PC relative branch instructions

The sign8 immediate in PC relative branch instructions is extended to a signed 22-bit or a signed 32-bit

immediate. The sign8 immediate in PC relative branch instructions is multiplied by 2 for conversion to a

relative value for the jump address, and the derived value is then added to PC to determine the jump address.

The ext instructions extend this relative jump address value.

Extending to a 22-bit immediate

To extend the sign8 immediate to a 22-bit immediate, enter one ext instruction directly before the target

instruction.

Example: ext imm13

jrgt

sign8

S S S

SSSSSSS

31 22 21 9 8

imm13

sign8

Immediate

Current address

New address

The most significant bit “S” in the immediate that has been extended by the ext instruction is the sign, with

which bits 31–22 are extended to become signed 22-bit data. The most significant bit in

sign8 is handled as the

MSB data of 8-bit data, and not as the sign.

Extending to a 32-bit immediate

To extend the sign8 immediate to a 32-bit immediate, enter two ext instructions directly before the target

instruction.

Example: ext imm13 (1)

ext imm13 (2)

jrgt sign8

31 22 21 9 8

imm13 (2)

imm13

[12:3] (1)

sign8

Immediate

Current address

New address

The most significant bit “S” in the immediate that has been extended by ext instructions is the sign. Bits 2–0

in the first

ext instruction are unused.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Instrukcja Użytkownika Strona 37

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