Power On Sequence - Pioneer C-AX10 Service Manual

C-AX10

7.1.3 Power ON Sequence

Main Microcomputer (1/2) (IC2109)
AC check
Hardware register setting
of system controller
RAM initial setting
Destination check
RAM initial setting by
the destination
Data initial setting of the
output data at the power ON
Initial setting of the
expansion IC
(IC2107, IC2108)
LED initial setting
UART/FL bus
switch setting
External interrupt
start
FL lights process
start
Continue
86
Destination check
Port 70 (I/O ST) Destination
H KU/CA
L NY
Use port 70 as a destination port only in the power ON state, and use it as a strobe
port of the expansion IC in normal state.
Data initial setting of the output data at the power ON
Port Setting
24 DISPOFF H
66 OE L
Expansion IC initialized
IC2107
Port Setting
4 Q1 MT10 L
5 Q2 MT20 L
6 Q3 MT1I L
7 Q4 MT3I L
11 Q8 L
12 Q7 XVUP L
13 Q6 MT2I L
14 Q5 MTDI L
LED data initialized
IC2107
Port Setting
5 Q0 DG5I L
6 Q1 DG4I L
7 Q2 DG3I L
8 Q3 DG2I L
9 Q4 DG6I L
10 Q5 DIFI L
11 Q6 DG1I L
12 Q7 AN3I L
13 Q8 AN2I L
14 Q9 AN1I L
15 Q10 DVDI L
16 Q11 DISP L
UART/FL bus switch
Port 12 (XVUP) of IC2107
In normal use
In memory rewriting
Distinction of the speaker distance "m" and "feet".
IC2108
Port Setting
4 Q1 DOFF L
5 Q2 G+-6 L
6 Q3 XPHN L
7 Q4 G-06 L
11 Q8 VOL- L
12 Q7 VOL+ L
13 Q6 LFEG L
14 Q5 XDIV L
L : Lights out
H : Lights
H
L