Specifications - Pioneer M-AX10 Service Manual

Following item "1."~"7." (P.43~P.51) describe about the specifications
of IC901 PD5508B9.

SPECIFICATIONS

1. Basics
1.1 Reset
Perform the reset when connecting the AC power supply.
RESET
RAM set complete flag of EEPROM readout data
[ f_eeprom_rd_set ] = 0
AC check (Voltage of ACSUB)
Register initialize
RAM initialize
EEPROM readout
BACKUP
check OK ?
N
RAM clear for memory communication
Flag for the power ON
Flag for initializing
Timer [ tminit ] = 50 msec set
RETURN
Fig. Flow chart of RESET
Perform reading from the EEPROM while RAM is being initialized
after the AC power is turned on (port 25 (Pin25) (RESET): L).
Set the read data to RAM using "initcont" after resetting is completed.
(See "2. Initializing.(P.44)")
Y
[ f_power ] = 1
(IC901
Internal Port)
[ f_i nit ] = 1
1.2 BACKUP Mode
Backup is performed when the AC power is turned off.
SPRYH (port 16) and SPRYG (port 17) are set to "L" 10 ms after
the BACKUP port becomes "L."
All the indicators and lamps go dark.
Execution of the BACKUP processes (port processing and register
processing) begins 30 ms later.
Last memory writing to the EEPROM is performed each time a key
is operated, but not performed in the backup processes.
Port processing
1) I/O ports are specified as output ports.
2) Output ports are set to "L."
Backup targets
INPUT1/2, ATT.THROUGH, ATT. HOLD (The level value is also
backed up when ON), ILL.
(The VOLUME level and mode settings at the mechanical switch
are checked each time the power is turned on.)
BRD.
ILL Bright / dark / off
INPUT 1/2
ATT. THR
ATT. HOLD
ATT. LEVEL
As writing to ROM may require 40 ms at maximum, 5 V will be
supplied to the microcomputer for about 100 ms after the AC power
is turned off at the hardware.
The data to be written are composed of the following 3 bytes:
1 Bit 0 ILL1
Bit 1 ILL2
Bit 2 INPUT
Bit 3 ATT. THROUGH
Bit 4 ATT. HOLD
Bit 5 SEPARATE
Bit 6 DUAL
Bit 7 BRIDGE
2
VOLUME position (5 bit)
* At ATT. HOLD ON only
3 BACKUP code
Communication is made using ports 34 (SDA) and 35 (SCL) as
output ports.
IC901 PD5508B9
M-AX10
DUAL PRO.
ON/OFF
ON/OFF
At ATT. HOLD
ON only
ON/OFF
ON/OFF
1/2
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
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