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ZiLOG Z8 Technical Manual

ZiLOG Z8
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Appendix B
Control Registers
Registers
R240 SIO
Serial
1/0
Register
(FO
H
;
Read/Write)
I~I~I~I~I~I~I~I~I
L-I
__
SERIAL DATA
(0,
LSB)
R241
TMR
Timer Mode Register
(FIH;
Read/Write)
I~I~I~I~I~I~I~I~I
NOT
USED
~
00
-.J
1 = LOAD
T,
~,g~~
:
~~
0 = DISABLE
T,
COUNT
INTERNAL CLoCK
OUT.
11
1 = ENABLE
T,
COUNT
TOUT
MODES j
~~o
=
NO
FUNCTION
T MODES 0 =
NO
FUNCTION
EXTERNAL CLOCK
INP'OT
00
1 = LOAD T,
2037-014
GATE INPUT =
01
0 = DISABLE T, COUNT
(NON.R~~~~g~~~~:~~
z
10
1 = ENABLE T, COUNT
TRIGGER INPUT =
11
(RETRIGGERABLE)
R242
TI
Counter Timer I Register
(F2H;
Read/Write)
T, INITIAL VALUE (WHEN WRITTEN)
'-----(RANGE
1-256 DECIMAL 01-00
HEX)
T, CURRENT VALUE (WHEN READ)
R243
PREI
Prescaler I Register
(F3H;
Write
Only)
I~I~I~I~I~I~I~I~I
~L
COUNTMODE
o = T, SINGLE·PASS
1 = T, MODULO·N
CLOCK SOURCE
1
= T, INTERNAL
o = T, EXTERNAL TIMING INPUT
(T'N)
MODE
PRESCALER MODULO
(RANGE: 1-64
DECIMAL
01-00
HEX)
R244
TO
Counter/Timer 0 Register
(F4H;
Read/Write)
T,INITIAL
VALUE (WHEN WRITTEN)
'-----(RANGE:
1-256 DECIMAL 01-00 HEX)
T,
CURRENT VALUE (WHEN READ)
R245
PREO
Prescaler 0 Register
(F5
H
;
Write
Only)
I~I~I~I~I~I~I~I~I
~L
COUNTMODE
o =
To
SINGLE·PASS
1 =
T,
MODULO·N
RESERVED
PRESCALER MODULO
(RANGE: 1-64 DECIMAL
01-00
HEX)
R246 P2M
Port
2 Mode Register
(F6H;
Write
Only)
P2,-P2,
1/0
DEFINITION
L-
___
0 DEFINES BIT
AS
OUTPUT
1
DEFINES BIT
AS
INPUT
R247
P3M
Port 3 Mode Register
(F7
H
;
Write
Only)
I~I~I~I~I~I~I~I~I
I
PORT
2 PULL·UPS ACTIVE
RESERVED
o
P32
= INPUT
P35
= OUTPUT
[g~
LO
PORT
2 PULL·UPS OPEN DRAIN
1
P32
=
DAVOIRDYO
P35
=
RDYO/l!AVO
o 0
P33
= INPUT
P34
= OUTPUT
~
~
l
P33
= INPUT
P34
=
DM
11
P33
= DAVlIRDYI
P34
=
RDYlIDAVI
o
P31
= INPUT
(T'N)
P36
= OUTPUT
(TOUT)
1
P31
= DAV2IRDY2
P36
= RDY2IOI\V2
L-
______
~
~~~
~
~Ne':t~!L
IN
~~~
~
~~~rA~TOUT
L.
________
~
~:~:i~
g~F
B-1

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ZiLOG Z8 Specifications

General IconGeneral
BrandZiLOG
ModelZ8
CategoryDesktop
LanguageEnglish

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