Apc5890, Aplus integrated circuits inc – Rainbow Electronics APC5890 User Manual
Page 8
APLUS INTEGRATED CIRCUITS INC.
APC5890
www.aplusinc.com.tw
TEL : 886-2-2782-9266
8
z
3FEB
:
B
ANK REGISTER
MSB
BIT FOR COPROCESSOR
.
W
RITE ONLY
.
B
ANK REGISTER IS
9
BITS REGISTER
($3FEB
BIT
0,
$3FEA
BIT
7-0).
T
HE MEMORY RANGE OF
BANK IS FROM
$4000
TO
$7FFF.
B
IT
7-1
:
R
ESERVED
.
z
3FEC,3FED
:
T
IMER
A
DATA OR TONE
0
GENERATOR
.
R
EAD AND WRITE
.
A
FTER TIMER
_
A BE
ENABLED
,
THE TIMER WILL START TO COUNT DOWN
.
W
HEN TIMER COUNTS TO ZERO
,
THE
TIMER WILL COUNT FROM THE INITIAL VALUE AND TIMER
_
A
IRQ
WILL BE HAPPEN
.
T
HE TIME ELAPSE
=
(($3FED,$3FEC)+1)
/
(T
IMER
A
INPUT CLOCK
).
z
3FEE
:
T
IMER
B
LOW BYTE DATA
.
R
EAD AND WRITE
.
z
3FEF
:
T
IMER
B
HIGH BYTE DATA
.
R
EAD AND WRITE
.
A
FTER TIMER
_
B BE ENABLED
,
THE TIMER WILL START TO COUNT DOWN
.
W
HEN TIMER
COUNTS TO ZERO
,
THE TIMER WILL COUNT FROM THE INITIAL VALUE AND TIMER
_
B
NMI
WILL
BE HAPPEN
.
T
HE TIME ELAPSE
=
(($3FEF,$3FEE)+1)
/
(T
IMER
B
INPUT CLOCK
).
z
3FF0
:
P
ORT
_
A
[15..8]
DIRECTION REGISTER
.
W
RITE ONLY
.
A
N
‘1’
IN THIS REGISTER WILL SET THE CORRESPONDING PIN OF PORT
_
A TO BE OUTPUT
.
T
HE DEFAULT VALUE FOR EACH BIT IS ZERO
.
z
3FF1
:
P
ORT
_
A
[15..8]
DATA REGISTER
.
R
EAD AND WRITE
.
z
3FF2:
P
ORT
_
B
[11..8]
DATA REGISTER
.
W
RITE ONLY
.
B
IT
3-0:
P
ORT
_
B PIN
11
TO PIN
8.
B
IT
7-4
:
R
ESERVED
.
z
3FF4
:
B
ANK REGISTER FOR
CPU.
W
RITE ONLY
.
z
3FF5
:
B
ANK REGISTER
MSB
BIT FOR
CPU.
W
RITE ONLY
.
B
ANK REGISTER IS
9
BITS REGISTER
($3FF5
BIT
0,
$3FF4
BIT
7-0).
T
HE MEMORY RANGE OF BANK IS FROM
$4000
TO
$7FFF.
B
IT
1:
R
ESERVED
.
B
IT
2:
=
1
V
OICE
0
BUFFER BE TRANSFERRED TO
DAC
PORT DIRECTLY
.(
DEFAULT
)
=
0
V
OICE
0
BUFFER WILL BE TRANSFERRED TO
DAC
PORT WHEN TIMER
_
B
NMI
HAPPEN
.
B
IT
7-3
:
R
ESERVED
.