Rainbow Electronics APC5890 - Manual (Page 7)

APLUS INTEGRATED CIRCUITS INC.
APC5890
www.aplusinc.com.tw TEL : 886-2-2782-9266 7
BIT – 3 ~ 2
00 : SYSTEM CLOCK = F XOSC /2 X 256(4.19MH Z )( DEFAULT ).
01 :
SYSTEM CLOCK
= F
XOSC
/2 X 512(8.38MH
Z
)
10 :
SYSTEM CLOCK
= F
XOSC
/2 X 768(12.58MH
Z
)
BIT- 7 ~ 4
0
XXX
: F
IX
-
TIMER DISABLE
.
1000 : F IX - TIMER = 64H Z .
1001 : F IX - TIMER = 32H Z .
1010 : F
IX
-
TIMER
= 16H
Z
.
1011 : F
IX
-
TIMER
= 8H
Z
.
1100 : F
IX
-
TIMER
= 4H
Z
.
1101 : F
IX
-
TIMER
= 2H
Z
.
1110 : F
IX
-
TIMER
= 1H
Z
.
1111 : F IX - TIMER = 0.5H Z
z 3FE3 : P
ORT
_
A
[7..0]
INTERRUPT ENABLE REGISTER
. W
RITE ONLY
.
A N ‘0’ IN THIS REGISTER WILL SET THE INTERRUPT FUNCTION OF THE CORRESPONDING PIN OF
PORT _ A TO BE ENABLED . T HE DEFAULT VALUE FOR EACH BIT IS ‘1’.
z 3FE4 : P ORT _ A [7..0] DATA REGISTER . R EAD AND WRITE .
z 3FE5 : P
ORT
_
A
[7..0]
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 3FE6: P ORT _ B [7..0] DATA REGISTER . W RITE ONLY .
z 3FE7 : C
LEAR WATCHDOG TIMER
. W
RITE ONLY
.
T
HE WATCHDOG TIMER RESET WILL HAPPEN IF THE PROGRAMMER DO NOT CLEAR THE
WATCHDOG TIMER BEFORE WATCHDOG TIMER TIME
-
OUT
.
z 3FE8 V
OICE CHANNEL
0
LOW BYTE
. W
RITE ONLY
.
B
IT
2-0 : R
ESERVED
.
B
IT
3:
NO USE
(
MUST
0)
B
IT
7-4: = V
OICE CHANNEL
0
LOW NIBBLE BYTE
.
z 3FE9 : V
OICE CHANNEL
0
HIGH BYTE
. W
RITE ONLY
.
T HE RESOLUTION OF VOICE CHANNEL 0 IS 12 BITS ($3FE9,$3FE8 BIT 7_4).
z 3FEA : B ANK REGISTER FOR COPROCESSOR . W RITE ONLY .