ZEN2011P Zenic, ZEN2011P Datasheet - Page 3

• Manufacturer Part Number: ZEN2011P
• Description: Programmable Universal Counter
• Manufacturer: Zenic

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3, Pin Description
(1)
E XTA E xt er n a l A(Ou t pu t )
(2)
CLK
(3)
RE SE T Reset (In pu t )
(4)
CE
(5)
C/D
(6)
RD
(7)
WR
(8)
LD
(9)
LT
(10~13,15~18)
D0~ Da t a bu s(Bidir ect ion a l 3-st a t e)
D7
Com m a n d/da t a select (In pu t )
Th is ou t pu t depen ds on t h e com m a n d m ode.
In m ode 0, E XTA ou t pu t s t h e equ a l sign a l
In Mode 1, eit h er of da t a (E QA),
(E QA+E QB) or (IN TE QA) is select ed by t h e
Refer t o "5-3 Mode 1 com m a n d for m a t ".
Th e CLK ser ves a s a clock in pu t solely t o
syn ch r on ize t h e in t er n a l cir cu it oper a t ion of
t h e
Th e RE SE T in it ia lizes t h e u p/down cou n t er ,
ph a se discr im in a t ion cir cu it , com m a n d
r egist er ,a n d st a t u s r egist er .
A "Low" level a t t h is in pu t en a bles t h e
ZEN2011P
in pu t fr om t h e CP U du r in g a wr it e cycle,
or t o t r a n sm it a da t a t o t h e CP U du r in g
a r ea d cycle.
Th e C/D defin es t h e t ype of in for m a t ion
t r a n sfer per for m ed bet ween t h e CP U a n d
t h e
Th e RD is a st r obin g sign a l for r ea din g
da t a fr om a n in t er n a l r egist er .
Th e WR is a st r obin g sign a l for wr it in g
da t a in t o a n in t er n a l r egist er .
Th e LD collect ively t r a n sm it s t h e da t a
st or ed in t h e pr eloa d r egist er t o t h e
u p/down cou n t er .
Th e LT collect ively st or es t h e da t a of
t h e u p/down cou n t er in t o t h e r ea din g
r egist er .
Cou n t da t a la t ch *(In pu t )
Ch ip en a ble(In pu t )
Da t a loa din g t o t h e cou n t er *(In pu t )
Rea d st r obin g(In pu t )
Clock (In pu t :sin gle ph a se clock)
Wr it e st r obin g(In pu t )
(E QA).
com m a n d a n d it is ou t pu t .
ZEN2011P
ZEN2011P
t o a ccept a com m a n d or a da t a
.
.
- 3 -
(19)
E XTB E xt er n a l B (I/O)
(20)
Z/CLR Cou n t er clea r *(In pu t )
(21)
B/DN Cou n t pu lse in pu t B or DN *(In pu t )
(22)
A/U P Cou n t pu lse in pu t A or U P *(In pu t )
(23~25)
SE L0~SE L2
(26)
DIR
(27)
U D/AB U p/down or du a l ph a se pu lse m ode select
(14)
VSS
(28)
VDD
N ot e: Sign a ls wit h (*)m a r k a r e sa m pled by CLK.
Th e da t a set depen din g on t h e com m a n d is
in pu t or ou t pu t .
In m ode 0, E XTB is set a s u n iva r sa l in pu t
t er m in a l U a n d it is m on it or ed by t h e st a t u s
r egist er .
In Mode 1, E XTB is set a s a n ou t pu t t er m in a l,
eit h er of da t a (E QB), (INTAI) or (IN TE QB)
is select ed by t h e com m a n d a n d it is ou t pu t .
Refer t o "5-3. Mode 1 com m a n d for m a t ".
Th e Z/CLR a ccept s r eset sign a l wh ich clea r s
t h e u p/down cou n t er da t a .
Th e B/DN a n d A/UP a ccept s cou n t pu lse
sign a ls for t h e 24 bit cou n t er .
Cou n t er m ode select (In pu t )
Th e con dit ion s of t h ese pin s defin e t h e
cou n t er oper a t ion m ode t o sin gle ph a se or t o
du a l ph a se.
Th is defin it ion is effect ive wh en U D/AB
Th e DIR select s t h e cou n t dir ect ion of t h e
u p/down cou n t er .
(In pu t )
P lea se r efer t o t h e pa r a gr a ph of "4-3.
Select ion of cou n t er oper a t ion m ode".
Sa m pled a t t h e r isin g edge of CLK:
Sa m pled a t t h e fa ilin g edge of CLK:
Cou n t er dir ect ion select (In pu t )
Gr ou n d(0v)
Su pply volt a ge(+5v)
="Low".
Z/CLR,B/DN ,A/U P
LD,LT.
ZEN2011P
ZENIC Inc.