Chapter 4 System Register

system register are as follows.

Table 4.1 System registers

Register name	Abbreviation	Address	Access	Function	Internal update timing
TV mode selection	TVMR	100000H	Write-only (word)	Specify TV display mode	PTM at any time VBE is a field
Frame buffer Switch mode	FBCR	100002H	Write-only (word)	Frame buffer switching and Double dense interlace	FCM and FMT for each field, for frame buffer Switch timing
Plot trigger	PTMR	100004H	Write only (word)	Control drawing start	01B light at any time, 00B, 10B light Frame buffer Switch timing
Erase Light Data	EWDR	100006H	Write-only (word)	Fill data in frame buffer during erase write Specification	Frame buffer Switch timing
Erase Light Top Left Coordinate	EWLR	100008H	Write-only (word)	Fill area of ​​frame buffer during erase write Specify upper left coordinate	Frame buffer Switch timing
Erase Light Lower right coordinates	EWRR	10000AH	Write-only (word)	Fill frame buffer during erase write Specify the lower right coordinates of the area	Frame buffer Switch timing
Forcibly finish drawing	ENDR	10000CH	Write-only (word)	Forcibly terminate drawing	anytime
Transfer end status	EDSR	100010H	Read-only (word)	Displays fetch status of end bit of previous frame	−
Process interruption table Address	LOPR	100012H	Read-only (word)	Previous frame final processing command Table address Display	−
Current processing table Address	COPR	100014H	Read-only (word)	Command table currently being processed Display of address	−
Mode State	MODR	100016H	Read only (word)	Display setting value for write-only register	−