Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 87)

7 DETAILS OF INSTRUCTIONS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

int imm2

Function

Software exception

Standard) sp

← sp - 4, W[sp] ← pc + 2, sp ← sp - 4, W[sp] ← psr,

← Software exception vector

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 2 1 0

0 0 0 0 0 1 0 0 1 0 0 0 0 0

imm2

0x048_

Flag

IE C V Z N

0 – – – –

Mode

Immediate data (unsigned)

CLK

Seven cycles

Description

Generates a software exception.

The

int instruction saves the address of the next instruction and the contents of the PSR into the

stack, then reads the software exception vector from the trap table and sets it to the PC. By this

processing, the program flow branches to the specified software exception handler routine.

The C33 PE supports four types of software exceptions and the software exception number (0 to 3)

is specified by the 2-bit immediate

imm2.

imm2 Vector address

Software exception 0: 0 Base + 48

Software exception 1: 1 Base + 52

Software exception 2: 2 Base + 56

Software exception 3: 3 Base + 60

The Base is the trap table beginning address set in the TTBR register (default: 0xC00000).

The

reti instruction should be used for return from the handler routine.

Example

int 2 ; Executes the software exception 2 handler routine.

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario Pagina 87