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HT9580 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc

Part # HT9580
Description  Character Pager Controller
PDF  63 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9580 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc

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HT9580
44
April 28, 2000
Preliminary
8 bits. The counter is incremented each time an
instruction or data is fetched from the program
memory.
Stack pointer
The stack pointer is an 8-bit register which is
used to control the addressing of the vari-
able-length stack. The stack pointer is auto-
matically incremented and decremented under
control of the microprocessor to perform stack
manipulations under direction of either the
program or interrupt (NMI and IRQ). The stack
allows simple implementation of nested sub-
routines and multiple level interrupts. The
stack pointer is initialized by the user¢s soft-
ware.
Status register
N
VEB
D
I
Z
C
Note: C: Carry 1=true
Z: Zero 1=true
I: IRQ 1=disable
D: Decimal mode 1=true
B: BRK command 1=BRK, 0=IRQ
E: Expansion bit (reserved)
V: Overflow 1=true
N: Negative 1=negative
70
A
A ccu m u l a t o r A
70
Y
I nde x R egi s t er Y
70
X
I nde x R egi s t er X
70
P C L
P r ogr am C ount er P C
70
S
S ta c k P o i n te r
158
PC H
T he w i dt h of t he c o r r e s p ondi ng r e gi s t er s
15
0
0
0
0
0
0
0
1



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