MC68HC05BD3 Datasheet, PDF (72/112 Pages) Motorola, Inc – HCMOS microcontroller

Clear 1st_time
Init VSIN=0
A
Y
B
VDET = 0?
Set VSIN=1
Y
HOVER = 1?
N
HSYNC too high
N
Y
HDET = 1?
N
Set VSIN=1
Y
VDET = 0?
N
Y
B
HDET = 1?
N
No HSYNC signal
Set Standby mode
8
Set SOUT=1
Y
VDET = 0?
N
Read registers
Y
VSIN = 1?
N
Y
HDET = 1?
N
No HSYNC
Set Standby mode
Set 1st_time=1
Clear VSIN=0
Y
1st_time = 0?
N
Y
HDET = 1?
N
Clear VSIN=0
Separated sync
Set Normal mode
Composite sync
Set Normal mode
No VSYNC
Set Suspend mode
A
No VSYNC
No HSYNC
Set Off mode
Figure 8-6 Typical Monitor System Operation
MOTOROLA
8-12
SYNC SIGNAL PROCESSOR
TPG
MC68HC05BD3