JVC TH-A5 Service Manual page 27

M6759 (U3) : MTP microcontroller
1. Pin layout
1
2
3
4
5
6
7
8
9
10
11
3. Block diagram
P0.7:0 P2.7:0
Port 0 Port 2
Drivers Drivers
Port Latch
Data Bus
Program Address
Register
64K bytes
MTP Memory
Program Counter
Incrementer
Buffer
DPTR
2. Pin function
Pin No.
44
22
33
36,37,38,39,
32
40,41,42,43,
31
10
30
21
29 20
32
28
33
27
9,8,7,6,
26
5,4,3,2
25
24 31,30,29,28,
27,26,25,24
23
19,18,17,16,
15,14,13,11
35
1,12,23,34
P1.7:0
Port 1
Drivers
Serial Port
Interrupt Logic
Port Latch
ACC
ALU REG1
PSW
512 Bytes RAM Addr.
RAM
OSC
Symbol I/O
VDD I Power supply for internal operation, 5V input
GND I Ground
P0.7-P0.0 I/O 8 bits bi-directional I/O port
AD7-0 I/O Multiplexed address/data bus
RST I Reset signal
XTAL1 I Crystal In
XTAL2 O Crystal out
/PSEN O Program Store Enable Output
ALE O Address Latch Enable
P1.7-P1.0 I/O 8 bits bi-directional I/O port
T2EX(P1.1) I External timer/counter 2 trigger
T2(P1.0) I External timer/counter 2.
P2.7 I/O 8 bits bi-directional I/O port
A15-A8 O
P3.7-P3.0 I/O 8-bit bi-directional I/O port
/RD(P3.7) O External data memory read strobe
/WR(P3.6) O External data memory write strobe
T1(P3.5) I External timer/counter 1
T0(P3.4) I External timer/counter .
/INT1(P3.3) I External interrupt 1 (Negative Edge Detect)
/INT0(P3.2) I External interrupt 0 (Negative Edge Detect)
TXD(P3.1) O Serial port output
RXD(P3.0) I Serial port input
/EAVPP I
NC -
P3.7:0
Port 3
Drivers
Timer
Port Latch
Data Bus
B Register
ALU REG2
Stack
Pointer
ALU
Data Bus
Instruction
Register Register
Clock and Control
Description
TH-A5
1-27