Circuit Description - Kenwood DPC-MP727 Service Manual

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1. Port Description of Microprocessor
Port No. Port Name
1 P60
2 P61
3 P62
4 P63
5~12 P50~P57
13~16 P20~P23
17 VDD
18 PB0
19 VSS
20 XI,PB1
21 XO
22 VDD
23 OSCI
24 OSCO
25 MODE
26 MCLK
27 MDATA
28 MLD
29 DSPRST
30 IPFLAG
31,32 PCON4,3
33 PCON2
34 AVDD
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L 13942296513
35 PCON1
36 AMUTE
37 HPMUTE
38 RWSEL
39 STAT
40 ACDET
41 BBST
42 HOLD
43 VREF-
44 LBATT
45 VOLUME
46 P46
47 P47,WDOUT
48 LEDDRV
49 ELDDRV
50 CHG
51 LCDSD
52 LCDRMC
53 PB5
54 VREF+
55,56 PB6,7
57 MP3 MLD
58 MP3 RESET
59 DATA STOP
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60 P93
61 AVSS
62,63 KEY1, 2
.
64 KEYEXT
65 RCHDET
66 VDD

CIRCUIT DESCRIPTION

I/O
O DSP (IC3) reset output.
- Unused.
O DSP (IC3) power down control.
- Unused.
- Unused.
- Unused.
- +3.0v power supply.
- Unused.
- GND
- Unused.
- Unused.
- +3.0v power supply.
I Crystal oscillation circuit input.
O Crystal oscillation circuit output.
- Connected to VDD.
O DSP (IC15) command clock signal output.
O DSP (IC15) data signal output.
O DSP (IC15) command load signal output.
O DSP (IC15) reset signal output.
I Unused.
- Unused.
O RF AMP power down control.
- +3.0v analog power supply.
O System power supply control.
O Audio mute control.
O Headphones mute control.
O RF gain control.
I Status signal input from DSP (IC15).
I Detection port of AC adaptor.
O Control port of bass boost.
I Input port of hold switch.
- GND
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.
O Command load output for MP3.
O Reset output for MP3.
O Data signal output for MP3.
- Unused.
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- GND
I Key signal input.
i
I Remote control signal input.
Detection port for low rechargeable battery.
I
Detected : more than 0.2V
- +3.0v power supply.
DPC-MP727/MP922
2 9
8
Function
Q Q
3 6 7 1 3 1 5
co
.
9 4 2 8
ACTIVE
H
ON OFF
0 5 8 2 9 9 4 2 8
ON
ON
DETECTED
OFF
OFF
m
9 9
L
9 9
ON
ON
ON
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