UM6522A Datasheet, PDF (6/17 Pages) UMC Corporation – Versatile Interface Adapter (VIA)

Timing Waveforms (Continued)
UM6522/A
$2
CB2
SHIFT DATA
(OUTPUT)
CB1
SHIFT CLOCK
(INPUT OR OUTPUT)
/-- DELAY TIME MEASURED FROM THE FIRST 42
FALLING EDGE AFTER Cl31 FALLING EDGE.
Figure 5f. Timing for Shift Out with Internal or External Shift Clocking
$2
CB2
SH i FT DATA
(INPUT)
CB1
SHIFT CLOCK
(INPUT OR OUTPUT1
I
I
w ^{I I 1} TSR~
w
I
cI1
I
1
Y
-TSRB -
SETUP TIME MEASURED TO THE FIRST
RISING EDGE AFTER CB1 RISING EDGE
Figure 5g. Timing for Shift In with Internal or External Shift Clocking
CB1
SHIFT CLOCK
l NPUT
c
TICW -{ - - TICS
c
Figure 5h. External Shift Clocking
PB6
PULSE COUNT
INPUT
N
TIPW
f
*e
-\
TIPS
c
Figure 5i. Pulse Count Input Timing
CA1 , CA2
CBl, CB2
I
Figure 5j. Setup Time to Trigger Edge
t+
INTERRUPT
GENERATING
EDGE
Figure 5k. Shift-in/out with Internal Glock Delay CD2 to CB1 Edge