Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 80)

7 DETAILS OF INSTRUCTIONS

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

call %rb / call.d %rb

Function

Subroutine call

Standard) sp

← sp - 4, W[sp] ← pc + 2, pc ← rb

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

0 0 0 0 0 1 1 d 0 0 0 0

r b

0x060_, 0x070_

call %rb when d bit (bit 8) = 0

call.d %rb when d bit (bit 8) = 1

Flag

IE C V Z N

– – – – –

Mode

CLK

call Four cycles

call.d Three cycles

Description

(1) Standard

call %rb

Stores the address of the following instruction into the stack, then sets the contents of the

of the

rb register is invalid and is always handled as 0. When the ret instruction is executed in

the subroutine, the program flow returns to the instruction following the

call instruction.

(2) Delayed branch (d bit = 1)

call.d %rb

When

call.d is specified, the d bit in the instruction code is set and the following instruction

becomes a delayed instruction.

The delayed instruction is executed before branching to the subroutine. Therefore the address (PC

+ 4) of the instruction that follows the delayed instruction is stored into the stack as the return

address.

When the call.d instruction is executed, interrupts and exceptions cannot occur because traps

are masked between the

call.d and delayed instructions.

Example

call %r0 ; Calls the subroutine that starts from the

; address stored in the R0 register.

Caution

When the call.d instruction (delayed branch) is used, be careful to ensure that the next

instruction is limited to those that can be used as a delayed instruction. If any other instruction

is executed, the program may operate indeterminately. For the usable instructions, refer to the

instruction list in the Appendix.

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 180 181

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