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3.5 MISCELLANEOUS REGISTER
MISCELLANEOUS REGISTER (MISCR)
Address: 0009h
—
Read/Write
Reset Value: 0001 0000 (10h)
Bit 7= VSYNCSEL
DDC1 VSYNC Selection.
This bit is set and cleared by software. It is used to
choose the VSYNC signal in DDC1 mode.
0: VSYNCI selected
1: VSYNCI2 selected
Note: VSYNCI 2 is only available for the DDC cell,
not for the SYNC processor cell.
Bit 6= FLY_SYN
Flyback or Synchro Switch.
This bit is set and cleared by software. It is used to
choose the signals the Timing Measurement Unit
(TMU) will analyse.
0: horizontal and vertical synchro outputs analysis
1: horizontal and vertical Flyback inputs analysis
Bit 5= HSYNCDIVEN
HSYNCDIV Enable.
This bit is set and cleared by software. It is used to
enable the output of the HSYNCO output on PC0.
0: HSYNCDIV disabled
1:HSYNCDIV enabled
Bit 4= FAST
Fast Mode.
This bit is set and cleared by software. It is used to
select the external clock frequency. If the external
clock frequency is 12 MHz, this bit must be at 0,
else if the external frequency is 24 MHz, this bit
must be at 1.
Bit 3= ITBLAT
Falling Edge Detector Latch.
This bit is set by hardware when a falling edge
occurs on pin ITB/PD4 in Port D. An interrupt is
generated if ITBITE=1and the I bit in the CC
register = 0. It is cleared by software.
0: No falling edge detected on ITB
1: Falling edge detected on ITB
Bit 2= ITALAT
Falling Edge Detector Latch.
This bit is set by hardware when a falling edge
occurs on pin ITA/PD3 in Port D. An interrupt is
generated if ITAITE=1and the I bit in the CC
register = 0. It is cleared by software.
0: No falling edge detected on ITA
1: Falling edge detected on ITA
Bit 1= ITBITE
ITB Interrupt Enable.
This bit is set and cleared by software.
0: ITB interrupt disabled
1: ITB interrupt enabled
Bit 0= ITAITE
ITA Interrupt Enable.
This bit is set and cleared by software.
0: ITA interrupt disabled
1: ITA interrupt enabled
70
VSYNC
SEL
FLY_S
YN
HSYNC
DIVEN
FAST ITBLAT ITALAT ITBITE ITAITE