108 lines
3.2 KiB
HTML
108 lines
3.2 KiB
HTML
;===============================================================================
|
|
; __ ____ ____ ____ ___ _ __
|
|
; \ \ / / /_| ___| / ___( _ )/ |/ /_
|
|
; \ \ /\ / / '_ \___ \| | / _ \| | '_ \
|
|
; \ V V /| (_) |__) | |__| (_) | | (_) |
|
|
; \_/\_/ \___/____/ \____\___/|_|\___/
|
|
;
|
|
; Western Design Center W65C816 device definitions
|
|
;-------------------------------------------------------------------------------
|
|
; Copyright (C)2015 HandCoded Software Ltd.
|
|
; All rights reserved.
|
|
;
|
|
; This work is made available under the terms of the Creative Commons
|
|
; Attribution-NonCommercial-ShareAlike 4.0 International license. Open the
|
|
; following URL to see the details.
|
|
;
|
|
; http://creativecommons.org/licenses/by-nc-sa/4.0/
|
|
;
|
|
;===============================================================================
|
|
; Notes:
|
|
;
|
|
; Various macros and definitions for the W65C816 microcontroller.
|
|
;
|
|
;===============================================================================
|
|
; Revision History:
|
|
;
|
|
; 2015-12-18 AJ Initial version
|
|
;-------------------------------------------------------------------------------
|
|
; $Id$
|
|
;-------------------------------------------------------------------------------
|
|
|
|
.65816
|
|
|
|
;===============================================================================
|
|
; Status Register Bits
|
|
;-------------------------------------------------------------------------------
|
|
|
|
N_FLAG .equ 1<<7
|
|
V_FLAG .equ 1<<6
|
|
M_FLAG .equ 1<<5
|
|
X_FLAG .equ 1<<4
|
|
B_FLAG .equ 1<<4
|
|
D_FLAG .equ 1<<3
|
|
I_FLAG .equ 1<<2
|
|
Z_FLAG .equ 1<<1
|
|
C_FLAG .equ 1<<0
|
|
|
|
;==============================================================================
|
|
; Macros
|
|
;------------------------------------------------------------------------------
|
|
|
|
; Puts the processor in emulation mode. A, X and Y become 8-bits and the stack
|
|
; is fixed at $0100-$01ff.
|
|
|
|
emulate .macro
|
|
sec
|
|
xce
|
|
.endm
|
|
|
|
; Puts the processor in native mode. The size of the memory and index register
|
|
; operations is not controlled by the M & X bits in the status register.
|
|
|
|
native .macro
|
|
clc
|
|
xce
|
|
.endm
|
|
|
|
; Resets the M bit making the accumator and memory accesses 16-bits wide.
|
|
|
|
long_a .macro
|
|
rep #M_FLAG
|
|
.longa on
|
|
.endm
|
|
|
|
; Resets the X bit making the index registers 16-bits wide
|
|
|
|
long_i .macro
|
|
rep #X_FLAG
|
|
.longi on
|
|
.endm
|
|
|
|
; Resets the M and X bits making the accumator, memory accesses and index
|
|
; registers 16-bits wide.
|
|
|
|
long_ai .macro
|
|
rep #M_FLAG|X_FLAG
|
|
.longa on
|
|
.longi on
|
|
.endm
|
|
|
|
; Sets the M bit making the accumator and memory accesses 16-bits wide.
|
|
|
|
short_a .macro
|
|
sep #M_FLAG
|
|
.longa off
|
|
.endm
|
|
|
|
short_i .macro
|
|
sep #X_FLAG
|
|
.longi off
|
|
.endm
|
|
|
|
short_ai .macro
|
|
sep #M_FLAG|X_FLAG
|
|
.longa off
|
|
.longi off
|
|
.endm
|