Yamaha CDR-HD1500 Service Manual page 33

IC2 : HD6417014F28 (MAIN P.C.B.)
µ-COM (CPU)
No. Port Name
21 Vcc
22 A17
23 Vss
24 /RAS N_RAS
25 /CASL N_CASL
26 /CASH N_CASH
27 Vss
28 RDWR RDWR
29 A18
30 A19
31 /WAIT N_WAIT
32 PB9 CPU_MUTE
33 Vss
34 /RD N_RD
35 /WDTOVF
36 /WRH N_WRH
37 Vcc
38 /WRL N_WRL
39 Vss
40 /CS1 N_CDR
41 /CS0 N_ROM
42 PA9 N_CPU_RST
43 /IRQ2 N_IRQ2
44 /CS3 N_CS3
45 PA6 SB_N_OSD
46 /IRQ1 N_INT_CDR
47 TXD1 TXD1
48 RXD1 RXD1
49 /IRQ0 N_INT_REM
50 TXD0 TXD0
51 RXD0 RXD0
52 D15
53 D14
54 D13
55 Vss
56 D12
57 D11
58 D10
59 D9
60 D8
61 Vss
62 D7
63 D6
64 D5
65 Vcc
66 D4
67 D3
68 D2
69 D1
70 D0
71 Vss
72 XTAL
73 MD3
74 EXTAL
75 MD2
I/O
+5V power supply
O Address bus
GND
O DRAM control
O DRAM control
O DRAM control
GND
O DRAM control
O Address bus
O Address bus
I WAIT input
O Output mute
GND
O Read strobe
(Unconnected)
O Write strobe
+5V power supply
O Write strobe
GND
O ACDR2 chip select
O Flash memory chip select
O Resetting peripheral devices
for extend
for extend
OSD IC chip select
I ACDR2 interrupt
O RS-232C output
I RS-232C input
I Remote control input
for extend
for extend
I/O Data bus
I/O Data bus
I/O Data bus
GND
I/O Data bus
I/O Data Bus
I/O Data Bus
I/O Data Bus
I/O Data Bus
GND
I/O Data Bus
I/O Data Bus
I/O Data Bus
+5V Power Supply
I/O Data Bus
I/O Data Bus
I/O Data Bus
I/O Data Bus
I/O Data Bus
GND
O Terminal for crystal oscillator
I Setting CPU operation mode
I Terminal for crystal oscillator
I Setting CPU operation mode
CDR-HD1500
Function
33