7-8. Ic Pin Function - Sony XR-C5300X Service Manual

7-8. IC PIN FUNCTION

• IC501 MASTER MICRO COMPUTER (MN101C49KTA) (MAIN Board)
Pin No. Pin Name
1 VREF
2 VSM
3 FMAGC
4 KEYIN1
5 KEYIN0
6 DSTSEL
7 RCIN0
8, 9 QUALITY
10 VREF
11 VDD
12 OSCOUT
13 OSCIN
14 VSS
15 XIN
16 XOUT
17 MMOD
18 NOSESW
19 BUSON
20 SYSRST
21 LCDSO
22 LCDCE
23 LCDCKO
24 RCIN1
25 RAMBU
I/O
Reference voltage (– side) of AD conversion Connect to power ground if no problems
—
such as noise
FM/AM common signal meter A/D conversion input terminal
I
AM (MW:SW:LW), FM S meter voltage detection terminal
FM AGC A/D conversion input terminal
I
FM AGC voltage detection terminal
I KEY input
I Use the AD conversion input
I Terminal for selecting and setting destination value Reads during reset
Rotary commander input
I
Use the AD conversion input
O Not used
Reference voltage (+ side) of AD conversion As current is always flowing, make sure that current
—
is supplied only when the power of the system is turned ON by the master microprocessor
— Power supply terminal
O Terminal connected to the oscillator
I Connected to the 18.432 MHz oscillator
— Ground terminal
I Terminal connected to the sub-clock (for clock) oscillator
O Connected to the 32.768 kHz oscillator
— Ground terminal
Front panel disconnection/attachment detection input terminal
I
A panel is present when "L"
BUS ON control output
O
Outputs "L" when UNI-LINK communication is activated
SYSTEM RESET control output
O
Outputs "L" when the UNI-LINK slave microprocessor is reset
LCD serial data output
O
Serial interface with LCD driver IC
Outputs "L" when OFF to prevent misoperations of the C-MOS port
LCD chip enable output terminal
O
Serial interface with LCD driver IC Outputs
"L" when OFF to prevent misoperations of the C-MOS port
LCD serial clock output
O
Serial interface with LCD driver IC
Outputs "L" when OFF to prevent misoperations of the C-MOS port
Rotary Commander Shift input terminal
I
Rotary Commander Shift input
RAM reset detection input
After clearing input reset to check if the RAM data has been damaged by decreasing
voltage, checks the RAM data within 50 ms Results
L= Clears the RAM as the power supply voltage of the microprocessor dropped
I
belowthe minimum data maintenance voltage
H= Checks the RAM damage check area as the power supply voltage of the
microproces sor has not dropped below the minimum data maintenance voltage
Clears the RAM if the RAM damage check area is damaged
Function
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