Adcom GTP-740, Service Manual

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25
GTP-740
1 VCC** 8 VDD***
2 IN+
+
_
7 OUT
3 IN- 6 GND
4 VEE* 5 LATCH
AC3 ASSEMBLY
U101: MAX903
MODEL CONTROL
MODA/
LIR XTAL EXTAL E IRQ XIRQ/V
PPE*
RESET
MODB/
V
STBY
OSC
CLOCK LOGIC
INTERRUPT
LOGIC
ROM OR EPROM
(SEE TABLE)
SERIAL
PERIPHERAL
INTERFACE
SPI
SERIAL
COMMUNICATION
INTERFACE
SCI
A/D CONVERTER
V
DD
V
SS
V
RH
V
RL
EPROM
(SEE TABLE)
RAM
(SEE TABLE)
M68HC11 CPU
* V
PPE
applies only to devices with EPROM/OTPROM.
BUS EXPANSION
ADDRESS
ADDRESS/DATA
STROBE AND HANDSHAKE
PARALLEL I/O
CONTROL
PORT C
CONTROL
PORT D PORT E PORT B PORT A
TIMER
SYSTEM
COP
PULSE A
CCUMULA
TOR
PERIODIC INTERR
UPT
PA
I
PA7/P
AI
PA6/OC2/OC1 PA5/OC3/OC1 PA4/OC4/OC1
PA3/OC5/IC4/OC1
PA2/IC1 PA2/IC2 PA0/IC3
PB7/ADDR15 PB6/ADDR14 PB5/ADDR13 PB4/ADDR12 PB3/ADDR11 PB2/ADDR10
PB1/ADDR9 PB0/ADDR8
PC7/ADDR7/D
AT
A7
PC6/ADDR6/D
AT
A6
PC5/ADDR5/D
AT
A5
PC4/ADDR4/D
AT
A4
PC3/ADDR3/D
AT
A3
PC2/ADDR2/D
AT
A2
PC1/ADDR1/D
AT
A1
PC0/ADDR0/D
AT
A0
STRB/R/W
STRA/AS
PD5/SS
PD4/SCK
PD3/MOSI PD2/MISO
PD1/TxD
PD0/RxD
PE7/AN7 PE6/AN6 PE5/AN5 PE4/AN4 PE3/AN3 PE2/AN2 PE1/AN1 PE0/AN0
OC2 OC3 OC4 OC5/IC4/OC1 IC1 IC2 IC3
STRB STRA SS SCK MOSI MISO TxD RxD
AS R/W
DEVICE RAM ROM EPROM EEPROM
MC68HC11E0 512 – – –
MC68HC11E1 512 512
MC68HC11E9 512 12 K – 512
MC68HC711E9 512 – 12 K 512
MC68HC11E20 768 20 K – 512
MC68HC711E20 768 20 K 512
MC68HC811E2 256 – – 2048
AC3 ASSEMBLY
U021: MC68HC11A
1
2
3
1.25V
POWER
GROUND
OUTPUT
AC3 ASSEMBLY
Q111: M51943A AC3 ASSEMBLY
U105, U109: UPC4560C
AMPLIFIER 1
OUTPUT
INVERTING
INPUT
NON-INVERTING
INPUT
V –
AMPLIFIER 2
V +
OUTPUT
INVERTING
INPUT
NON-INVERTING
INPUT
1
2
3
4
8
7
6
5
+ – – +
IC BLOCK DIAGRAM