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.
Function : CD (
∗
4)
Initial setting of CD decoder IC.
P5 CDCONT : "L"
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.
Release the system MUTE.
P22 SYSMUTE : "H"
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
