Special registers of SDBC (bit-addressable definition method)

'For 52 compatible MCU
'Const variables and Const variables are calculated at compile time
'By Wan Zhiyuan, sdbc
'Define bit-addressable data types
Type SFR_BIT_A
	Dim SFR_BIT_A As sfr 
	'Define the byte address sfr. If there is a variable with the same name as Type in Type, the compiler will treat it as the default variable
	'For example, if there is SFR_BIT_A in this type, then the external address for this class is actually the address for this variable
	'For example, Dim P0 As SFR_BIT_A at &H80, then P0=0 is equivalent to MOV #80H,0.
	'Then if you need a numeric variable name, you need to add $ in front of it, but if you reference it outside the class/type, you don't need to do that. The with statement also needs it.
	'Similar to P0.0=1. With P0.$0=1 End With
	'Address declarations in type will be fixed at compile time, similar to declaring P0 at 0x80, then $0~$7 are fixed to 0x80~0x87
	Dim $0 As sbit at &SFR_BIT_A
	Dim $1 As sbit at &SFR_BIT_A+1
	Dim $2 As sbit at &SFR_BIT_A+2
	Dim $3 As sbit at &SFR_BIT_A+3
	Dim $4 As sbit at &SFR_BIT_A+4
	Dim $5 As sbit at &SFR_BIT_A+5
	Dim $6 As sbit at &SFR_BIT_A+6
	Dim $7 As sbit at &SFR_BIT_A+7
End Type

'IO port definition
Dim P0 As SFR_BIT_A at &H80' declare P0 at position 0x80
Dim P1 As SFR_BIT_A at &H90' declare P1 at position 0x90
Dim P2 As SFR_BIT_A at &HA0' declare P2 at position 0xA0
Dim P3 As SFR_BIT_A at &HB0' declare P3 at 0xB0
'IO port definition ends