Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Bedienungsanleitung PDF herunterladen (Seite 48)

5 INSTRUCTION SET

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

When extended by two ext instructions

ext imm13

ext

imm13'

sign8 Functions as “jp sign32”

The

imm13 specified by the first ext instruction is effective for only 10 bits, from bit 12 to bit 3 (with the 3

low-order bits ignored), so that

sign32 is configured as follows:

sign32 = {imm13[12:3], imm13', sign8, 0}

31 22 21 9 8

imm13'

imm13

[12:3]

sign8

sign32

Current address

Branch destination address

The range of addresses to which jumped is (PC - 2,147,483,648) to (PC + 2,147,483,646).

The above range of addresses to which jumped is a theoretical value, and is actually limited by the range of

memory areas used.

For

jpr branch

jpr %rb

A signed 32-bit relative value is specified for

rb.

The jump address is configured as follows:

{

rb[31:1], 0}

W[31:1]

[%rb]

Current address

Branch destination address

The least significant bit in the rb register is always handled as 0.

The range of addresses to which jumped is (PC - 2,147,483,648) to (PC + 2,147,483,646).

The above range of addresses to which jumped is a theoretical value, and is actually limited by the range of

memory areas used.

Branch conditions

The

jp and jpr instructions are unconditional jump instructions that always cause the program to branch.

Instructions with names beginning with

jr are conditional jump instructions for which the respective branch

conditions are set by a combination of flags, so that only when the conditions are satisfied do they cause the

program to branch to a specified address. The program does not branch unless the conditions are satisfied.

The conditional jump instructions basically use the result of the comparison of two values by the cmp

instruction to determine whether to branch. For this reason, the name of each instruction includes a character

that represents relative magnitude.

The types of conditional jump instructions and branch conditions are listed in Table 5.14.1.1.

Table 5.14.1.1 Conditional Jump Instructions and Branch Conditions

jrgt

jrge

jrlt

jrle

jrugt

jruge

jrult

jrule

jreq

jrne

Greater Than

Greater or Equal

Less Than

Less or Equal

Unsigned, Greater Than

Unsigned, Greater or Equal

Unsigned, Less Than

Unsigned, Less or Equal

Equal

Not Equal

Instruction

Flag condition

!Z & !(N ^ V)

!(N ^ V)

N ^ V

Z | (N ^ V)

!Z & !C

Z | C

Comparison of A:B

A > B

A ≥ B

A < B

A ≤ B

A > B

A ≥ B

A < B

A ≤ B

A = B

A ≠ B

Remark

Used to compare

signed data

Used to compare

unsigned data

Comparison of A:B made when “cmp A,B”

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