Sharp CE-150 - Page 262

22
All and more about Sharp PC-1500 at http://www.PC-1500.info
2-3-5. BF flipflop
'Ille CPU has t wo suppli es of p ow er: VCCa nd VGG . As the IJF llipOop is d rive n by VGG .
the s
rnte of th e BF Oip nop is retained as long as V GG is in supply. even if VCC s11 1>ply is
ou t. The BF ni1 >llop is set when th e (! Fl input is tu rn ed fro m low 10 high le vel and r ese t
\vhcn t
he OFJ; ins1ructi()n is iss ued f ro 1 11 the (" l'l J.
Low state of signal is on the fl F Jl i pnor o ut put IJ FO when t he llipnop is act ive '""' h ig h
state of signal \vhcn i n ~t c1 i ve .
r--- -- ------ - - ------ --·- ------- --- ,
'. '(;G
I
' I
t
I
l
I
I
I
B i: flpfl:>p
f
I
.--:
SS Q
I
I
CPU L OCIC
I
I
I
t
or r
I
P. ()
I
fifO
I
l
I
~
I I
'
I
CN O
L--- -- ----- --- ----
- -
-
-
- - - -
___ ___ .J
)
!3FI
It is po ss ible to co nl prise a n1 e1no ry hackup systcn1 using this J~ F fl ip tl ( )p.
Do not sale this PDF!!!