Power On Sequence - Pioneer C-AX10 Service Manual

C-AX10
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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
TE
L 13942296513
Initial setting of the
expansion IC
(IC2107, IC2108)
LED initial setting
UART/FL bus
switch setting
External interrupt
start
FL lights process
start
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Destination check
Port 70 (I/O ST)
H
L
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
24 DISPOFF
66 OE
Expansion IC initialized
IC2107
Port
4 Q1 MT10
5 Q2 MT20
6 Q3 MT1I
7 Q4 MT3I
11 Q8
12 Q7 XVUP
13 Q6 MT2I
14 Q5 MTDI
LED data initialized
IC2107
Port
5 Q0 DG5I
6 Q1 DG4I
7 Q2 DG3I
8 Q3 DG2I
9 Q4 DG6I
10 Q5 DIFI
11 Q6 DG1I
12 Q7 AN3I
13 Q8 AN2I
14 Q9 AN1I
15 Q10 DVDI
16 Q11 DISP
UART/FL bus switch
In normal use
In memory rewriting
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8
Destination
KU/CA
NY Distinction of the speaker distance "m" and "feet".
Setting
H
L
IC2108
Setting Port
L 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+
Q Q
3 6 7 1 3
L 13 Q6 LFEG
L 14 Q5 XDIV
Setting
L
L
L
L
L
L
L
L
L
L
L
L : Lights out
L H : Lights
Port 12 (XVUP) of IC2107
H
L
.
9 4 2 8
Setting
L
L
L
L
L
L
1 5 0 5 8 2 9 9 4
L
L
m
co
9 9
2 8 9 9