Marantz SR-66 - SERVICE TEST PROGRAM OF THE MICROPROCESSOR (continued); Microprocessor Key Matrix (continued); Microprocessor Block Diagram

2. Key Matrix
K. SCANO K. SCAN1 K. SCAN2 K. SCAN3
PIN 61 PIN 62 PIN 63 PIN 64
KEY IN1 TUNING/
PIN 43 cance PRESET a
KEY IN2
PIN 42 TREBLE VCR2 PROGRAM po
KEY IN3
KEY IN4 .
KEY IN5 |
PIN 39 TUNING UP TAPE | ed POWER
3. Block Diagram
eo
TOO/P30 O 16 ba TIMER/ Gut
TIO/INTPO/POO O—=| EVENT COUNTER PROGRAM COUNTER on fee PIO-P17
TO1/P31 © B bit TIMER/ =) J .
T11/P33 © EVENT COUNTER | Say roma E> P20-P27
GENERAL REG. K___ >
wee we mee ee wee
DECODE
AUD
CONTROL
TO2/P32 O-——| bil TIMER/ eum
ROM
TI2/P34 Oey EVENT COUNTER 2 PROGRAM MEMORY
f
WATCHDOG TIMER K_ >
“WATCH TIMER |
Cofem_f> mm
g r=
d
Pad, P8i
WN
CIO/INTP3/PO3
O—~|
EH
UP/DO
ms
|
ae —
S
PORTO P90-P97
S10/SBO/P25 Oo
SERIAL
SOB Uees 2 INTERFACE O a
SCKO/P27
©
:
100-P107
s})/P20 ©
SO}/P21 ©
SERIAL >
SCKI/P22 © INTERFACE 1
sTB/P23
©
P)10-P117
BUSY/P24 ©
ANIO/P10
~ANII/P17
BUZ/P36 — PCL/P3S P120-P127
Vee O-——{A/D CONVERTERK >
AY,, ©
AVace O
INTPO/TIO/POO | INTERRUPT
-INTP3/C10/PO3 CONTROL
FIPO-FIP33
25