DPC-MP727/MP922
3
CIRCUIT DESCRIPTION
Port No.
Port Name
I/O
Function
ACTIVE
H
L
1
P60
O
DSP (IC3) reset output.
2
P61
-
Unused.
3
P62
O
DSP (IC3) power down control.
ON
OFF
4
P63
-
Unused.
5~12
P50~P57
-
Unused.
13~16
P20~P23
-
Unused.
17
VDD
-
+3.0v power supply.
18
PB0
-
Unused.
19
VSS
-
GND
20
XI,PB1
-
Unused.
21
XO
-
Unused.
22
VDD
-
+3.0v power supply.
23
OSCI
I
Crystal oscillation circuit input.
24
OSCO
O
Crystal oscillation circuit output.
25
MODE
-
Connected to VDD.
26
MCLK
O
DSP (IC15) command clock signal output.
27
MDATA
O
DSP (IC15) data signal output.
28
MLD
O
DSP (IC15) command load signal output.
29
DSPRST
O
DSP (IC15) reset signal output.
30
IPFLAG
I
Unused.
31,32
PCON4,3
-
Unused.
33
PCON2
O
RF AMP power down control.
34
AVDD
-
+3.0v analog power supply.
35
PCON1
O
System power supply control.
ON
36
AMUTE
O
Audio mute control.
ON
37
HPMUTE
O
Headphones mute control.
ON
38
RWSEL
O
RF gain control.
39
STAT
I
Status signal input from DSP (IC15).
40
ACDET
I
Detection port of AC adaptor.
DETECTED
41
BBST
O
Control port of bass boost.
OFF
ON
42
HOLD
I
Input port of hold switch.
OFF
ON
43
VREF-
-
GND
44
LBATT
I
Battery level detection port.
I
Input port of volume.
O
Crystal oscillation circuit is stopped when in stop mode(Hi).
-
Unused.
-
Unused.
-
Unused.
O
Rechargeable active output. Batt. charge ON : H
O
Serial data output for LCD.
-
Unused.
-
Unused.
-
+3.0v power supply.
-
Unused.
57
MP3 MLD
O
Command load output for MP3.
58
MP3 RESET
O
Reset output for MP3.
59
DATA STOP
O
Data signal output for MP3.
60
P93
-
Unused.
61
AVSS
-
GND
62,63
KEY1, 2
I
Key signal input.
64
KEYEXT
I
Remote control signal input.
65
RCHDET
I
Detection port for low rechargeable battery.
Detected : more than 0.2V
66
VDD
-
+3.0v power supply.
1. Port Description of Microprocessor
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