#
# PIC-16 Main Section
#   includes constants, memory space and common register space definitions
#
define endian=little;
define alignment=2;

# Instruction Memory (ROM-based)
define space CODE type=ram_space wordsize=2 size=2 default;

# General Purpose Register Memory consists of 4-banks of 255-bytes for PIC16,
# or 32-banks of 255 bytes each for PIC_16F.
# Bank selection occurs using STATUS register bits RP0 & RP1
define space DATA type=ram_space size=2; 

# HWSTACK consists of a 8-word by 13-bit RAM and a corresponding to a hidden stack pointer (STKPTR).
define space HWSTACK type=ram_space wordsize=2 size=1;  # WORDSIZE is actually 13-bits
 
define space register type=register_space size=2; 

# Program Counter (13-bits) - PC Latch: PCLATH<PC:12-8> / PCL<PC:7-0>
define register offset=0x0000 size=2 [ PC ];

# Stack Pointer
define register offset=0x0002 size=1 [ STKPTR ];

# Working register
define register offset=0x0003 size=1 [ W SkipNext ];

# Status bit registers (these do not really exist and must get reflected into the STATUS byte register)
define register offset=0x0007 size=1 [ IRP RP ];

@define C  "STATUS[0,1]"
@define DC "STATUS[1,1]"
@define Z  "STATUS[2,1]"
@define PD "STATUS[3,1]"
@define TO "STATUS[4,1]"
@define RP "STATUS[5,2]"
@define IRP "STATUS[7,1]"

# STATUS bit definitions
@define STATUS_IRP_BIT	7
@define STATUS_RP_BIT	5
@define STATUS_Z_BIT	2
@define STATUS_DC_BIT	1
@define STATUS_C_BIT	0

# STATUS bit masks used for setting
@define STATUS_IRP_MASK 0x80
@define STATUS_RP_MASK	0x60
@define STATUS_Z_MASK	0x04
@define STATUS_DC_MASK	0x02
@define STATUS_C_MASK	0x01

# STATUS bit masks used for clearing
@define STATUS_IRP_CLEARMASK 0x7F
@define STATUS_RP_CLEARMASK	0x9F
@define STATUS_Z_CLEARMASK	0xFB
@define STATUS_DC_CLEARMASK	0xFD
@define STATUS_C_CLEARMASK	0xFE


#
# WARNING! - Reflection of these DATA-based registers with the corresponding register
#            is not fully implemented due to the complexity of doing so within this language specification.
#            Reflection of certain registers (e.g., STATUS) within other memory banks is also not modeled.
#
# NOTES	-
#   1. Chips with voltage comparator and reference functions may replace A/D registers (ADCON0 and ADCON1) with (VMCON and VRCON)
#      Instances of this include PIC16F627A/628A/648A (there could be others)
#	2. If a specific PIC-16 has a different register set, this file and the pic16.pspec file may be copied/renamed and
#      slightly modified to specify a the correct Register File Map.  
#

#
# Bank-0 File Registers
#
@if PROCESSOR == "PIC_16"
define DATA offset=0x0000 size=1 [
				INDF	_       PCL		STATUS  FSR		_       _       _       _       _       PCLATH  INTCON	_		_       _       _
];
@elif PROCESSOR == "PIC_16F"
define DATA offset=0x0000 size=1 [
				INDF0	INDF1	PCL		STATUS	FSR0L	FSR0H	FSR1L	FSR1H	BSR		WREG	PCLATH	INTCON	_		_		_		_
];
define DATA offset=0x0004 size=2 [ FSR0  FSR1 ];
@endif

# Additional Data Bank data registers are defined in the .PSPEC file.