Intel mcs-48 manual Scan Timing Scan Waveforms, Display Waveforms

8279 SCAN TIMING

SCAN WAVEFORMS

S,

ENCODED

SCAN

S,

L

L L

u u u

S'-U u u u

DECODED

SCAN

S,

S,

u u

u u

u

u Lf

DISPLAY WAVEFORMS

	f-------640~s=84tCy·------·			ASSUME INTERNAL FREQUENCV = 100 kHz
				SOtCy=10~s
So
S,
Ao- A3	BLANK	A(O)	BLANK	A(1)
ACTIVE HIGH	CODE'		CODE·

·BLANKCODe IS EITHER ALL a's OR ALL 1', OR 20 HEX

80- 8 3

ACTIVE HIGH

RLo- RL7

NOTE: SHOWN IS ENCODED SCAN LEFT ENTRY

~·S3 ARE NOT SHOWN BUT THEY ARE SIMPLY 81 DIVIDED BY 2 AND 4

9-81 AFN-Q0742A-12