Sharp PC-1500 - Page 75

All and more about Sharp PC- 1500 at http:/lwww.PC-1500.info
3-3. Internal structure
70
3-3-1. Block diagram
The 1/ 0 port controller co nsists of nine internal r eg isters. wait co ntroller. se rial cont roller,
and interrupt controller, and each of internal registers can be accessed as one loca ti on of
the memory as
se en from the CPU .
1/0 port controller system block diagram
""T 111(1
,---- -- -- -- -- - --
f> llJ- 1
'1 $. S l- ¥$. Sl• OIO
'fOC - •. S•0 .5 V
Pll0 - 1
3-3-2. · Internal registers
(!) G register (RSJ ~ O = 1001)
GI "::s I G5 ' aj__ G3 ' GI ' Cl ! 00
~ - - 'L -
L::::: i\t - ,,]
O 4' - ml erna l clock
1 ._ t>ee 1t1 erna1 cloc kr J
•
ln 1~NI cloc .k
Cl oc k de ri ved lrom
4>0 $
•
&tem•I cl ock
Cl oc k oe n V(!.d fr om
CLO .
(• ~ .. . e,y clock t1ue 1s aete, .
mm cd by G0 - 02
~ lf Oescdp11o n
1
o
1
c~ ou 1 pu 11 n ti• b 1t e<1 ~
I
Cl ocit. ovtp.. 11
(• !EffOChve Only 1n 1h e
1titernal cloclc m ooe
O! GJ .:::: O.
C ~ Ct>
0 0
0
1
0
0
1
0
1
I
0
I
0
"" -'
••
00- 1
-
G2 (.i
00
Clock rti to
0 0 0
</>-<- 1
0 0 I
.,.,.z
~ 1
0
., .,.128
0 I
1 <P+256
I
0
0
<P + 512
1
0
1
<1>+1024
!+fr?.
1 1
" + 20-18
<1>+4 ~
' --
cs 1t Pfpt ec ri.;. rge11mo1 lA ( atOe\\S 1 ... -ne-)
ol 2.5! II. St
1 I
2.S t 6. 5t
0
2.51
I
3.St
.
1 2.St
.
2.St
0
I. St 12.5t
I 1.5 ! 7.St
'
WAIT
controt
.
......
. ""
• OM EO
1
fl l W
: li'. !4
...
. ,,
. .,
'"'
:cs:
' '"
'
I 1
0
L St
4.St
1: CPU opo 1 <i un 11
I 1 1 I. St 3.St
I trequency
TI 1e G r egi ~t er can read/write data wh en register is se lec te d (1001).
Do not sell this PDF !! !