Sharp PC-1500 - LH5810 I;O Port Pin Assignments and Descriptions

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2-2. Internal Structure
2-2-1. Block diagram
Fig. 1-1 Block diagram of LH5 801
0
AOO-AD 7
XLO X Ll
<t> DS WAIT HA NMI Ml
VGC
vcc
vss
s
x re g
v 1eg
u reg
T A
lnst rvct.on decoder
&. CP U con tr ol
LC D
t()-H7
bac k plale
VA
4
VB
po wor
VM
su~ly
con tr ot
VDIS
PU PV DISP
OPf S AK 8R Q RESE T OD R; W ME 0M E1 8f 0 8 FI 00-07 IN0- IN 7 PU PV DISP
Fig. 1-2 Internal register & flipflops
'
PH
'I
Pl
. ,
P: P r ~ram c ou n te r
r
SH
'I
SL
.,
S: S1 ack poi nter
XH • XL
8
Xregf Data pointer .
YH • Yl
8
Yreg : or
t- UH
•
UL
8
Ureg general purpose 1e91ste r
A
~
A:
Accumulator
TM
. ,
TM : Tu ne r
L '1
PU f
: Genera I purpose flipfl op
LJ
PV
L'.J
DISP: L CDon /off co nt1ol
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•
0
'o o IH v z 1E c r·. s
latus r e~ 1 s t e r
- C: Ca rry and borrow
(byte to byte)
- I E: Int err up t enable
- Z: Zero
V: Overf lo w
H: Carry
( d1 g1n to d1~1 t )
7