Yamaha AD8HR Service Manual page 13

LSI PIN DESCRIPTION
HD6437042AF53 (XY721A00) CPU
PIN
NAME I/O
NO.
1 TIOC4/DACK0/PE14 I/O MTU I/O / DMA acknowledge / Port E
2 PE15 O Port E
3 VSS I Ground
4 A0 O
5 A1 O
6 A2 O
7 A3 O
8 A4 O
9 A5 O
10 A6 O
11 A7 O
12 A8 O Address bus
13 A9 O
14 A10 O
15 A11 O
16 A12 O
17 A13 O
18 A14 O
19 A15 O
20 A16 O
21 VCC I Power supply
22 A17 O Address bus
23 VSS I Ground
24 /RAS/PB2 I/O Row address strobe / Port B
25 /CASL/PB3 I/O Column address strobe (low) / Port B
26 /CASH/PB4 I/O Column address strobe (high) / Port B
27 VSS I Ground
28 /RDWR / PB5 I/O DRAM read / write / Port B
29 A18//BACK/PB6 I/O Address bus / Bus acknowledge / Port B
30 A19//BREQ/PB7 I/O Address bus / Bus request / Port B
31 A20/PB8 O
Address bus/ Port B
32 A21/PB9 O
33 VSS I Ground
34 /RD O Read
35 /WDTOVF O Watch dog timer overflow
36 /WRH O High write
37 VCC I Power supply
38 /WRL O Low write
39 VSS I Ground
40 /CS1 O Chip select
41 /CS0 O Chip select
42 I/O Interrupt request / Timer clock/ Port A
/IRQ3/TCLKD/PA9
43 I/O Timer clock / Interrupt request / Port A
TCLKC//IRQ2 /PA8
44 /CS3 O Chip select
45 /CS2 O Chip select
46 /IRQ1/PA5 I/O Interrupt request / Port A
47 TXD1 O Data transmission
48 RXD1 I Data reception
49 /IRQ0/PA2 I/O Interrupt request / Port A
50 TXD0 O Data transmission
51 RXD0 I Data reception
52 D15 I/O
53 D14 I/O Data bus
54 D13 I/O
55 VSS I Ground
56 D12 I/O Data bus
（LSI 端子機能表）
FUNCTION
PIN
NAME I/O
NO.
57 D11 I/O
58 D10 I/O
Data bus
59 D9 I/O
60 D8 I/O
61 VSS I Ground
62 D7 I/O
63 D6 I/O Data bus
64 D5 I/O
65 VCC I Power supply
66 D4 I/O
67 D3 I/O
68 D2 I/O Data bus
69 D1 I/O
70 D0 I/O
71 VSS I Ground
72 XTAL I Crystal oscillator
73 MD3 I Mode control
74 EXTAL I Crystal oscillator
75 MD2 I Mode control
76 NMI I Non-maskable interrupt request
77 VCC I Power supply
78 MD1 I Mode control
79 MD0 I Mode control
80 PLLVCC I PLL Power supply
81 PLLCAP I PLL capacitor
82 PLLVSS I PLL Ground
83 PA15 / CK O Port A / Clock
84 /RES I Power on reset
85 PE0/DREQ0 I/O Port E / DMA request
86 PE1/DRAK0 O Port E / DMA acknowledge
87 PE2 O
88 PE3 O Port E
89 PE4 O
90 VSS I Ground
91 PF0 / AN0 I
92 PF1 / AN1 I
93 PF2 / AN2 I Port F / Analog input
94 PF3 / AN3 I
95 PF4 / AN4 I
96 PF5 / AN5 I
97 AVSS I Analog ground
98 PF6 / AN6 I
Port F / Analog input
99 PF7 / AN7 I
100 AVCC I Power supply
101 VSS I Ground
102 PE5 O Port E
103 VCC I Power supply
104 PE6 I/O
105 PE7 I/O
106 PE8 I/O Port E
107 PE9 O
108 PE10 O
109 VSS I Ground
110 PE11 O
Port E
111 PE12 O
112 /MRES I Manual reset
AD8HR
MAIN: IC2
FUNCTION
13