85
XC-IS21MD
7.2.2 SEQUNCE AFTER THE POWER ON
Standby states
P17 SYSPOW : "H"
P45 LCDRST : "L" RESET
Starts the LCD communication (
∗
2)
The condition that MUTE
is not released.
• VOLUME : 0
Microcomputer
MD Initialize Sequence
P94 : "H"
No
Yes
Yes
P70 MDPDOWN "H"
P69 MDRESET "H"
P67 MDSTB
P79 MDIDAT
P80 MDODAT
P81 MDCLK
Transfer
P28 VOLDATA
P34 VOLCLK
P75 EXPCE
System bus communication (
∗
1)
Transfer the system POWER ON.
Note 1 : IC No. or P
∗∗
without name indicate the pin No.
of microcomputer.
Note ;
∗
1 : System bus communication
P18 CLK
P19 DATA
P20 REQ
∗
2 : Starts the LCD communication
P47 LCDCLK
P44 LCDCE
P46 LCDDATA
∗
3 : Transfer the Function, Volume, BASS
and TREBLE data to the volume IC.
P13 VOLCE
P15 VOLDATA
P16 VOLCLK
∗
4 : Initial setting of CD decoder IC
P100 CDCLK
P1 CDLAT
P2 CDDATA
∗
5 : Initialize the TUNER PLL IC
P23 TXCE
P24 TXODAT
P25 TXCLK
P26 TXIDAT
50 msec ?
Release power
down detection
Power on
POWER ON
Power is ON.
Transmit the bus data.
Close the CD door.
Initialize the MD.
Initial setting of CD decoder IC.
Initialize the LCD Driver.
DECK control IC starts
the data transfer.
Does CD door open ?
Is P50 and P51 at "H" level ?
Perform the following process after
one second after the POWER ON.
Transfer the Function, Volume, BASS
and TREBLE data to the volume IC. (
∗
3)
Perform the following process after
3.9 seconds after the POWER ON.
Perform the following process after
4.0 seconds after the POWER ON.
Release the speaker relay.
P21 SPCONT : "H"
Function : TUNER (
∗
5)
Initialize the TUNER PLL IC.
P28 TXPOW : "H"
Release the
mechanism reset
No
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
