Yamaha FB-01 Service Manual page 10

Boot procedure
Power ON
I
▼
Wait for S RAM
to be initialized.
Panel
switch
scanning
RAM-ID
No. veri
fication
yesT^
Initialize OPP
Initialize UART
Wait for static RAM Ready.
(Confirm at 8000H and BFFFH addresses.)
Panel Switch scanning
Are only (system) (INST # ) and 1-1) pressed?
valid ?
Start
TEST program.
Start up the
Diagnostic (TEST)
program.
Initialize battery
backup area.
Initialize OPP
•Start iRQ (timer A. B)
MAIN
LOOP
MIDI
processing
Panel switch
processing
(IRQ)
/
RXRDY
(MIDI/IN)
IK byte
/
Timer B
(Switch)
1
byte
/
Timer A
(
•Acti
\ *Port
Active sensing measurement
Portamento treatment
/
TxRDY
(MIDI/OUT)
256 byte
Initialize UAPT
•Start iRQ (RX RDY)
After the power is turned ON, the FB-01 is initialized by the (A'
routine, and then the MAIN LOOP which is the (b) routine waits for
the input and executes each command according to the function that
was activiated.
Enable Interrupt Request
configuration.
(OPP erased)
Initialize LCD and
switch panel.
Ready message
displayed (Wait
for 3 seconds.)
Start MIDI receive
and panel switch
scanning.