Casio CASSIOPEIA A-20 User Manual

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No. Pin Name Io/Out Function To/From
58 A15 O Address bus
59 Vss GND
60 Vcc +3.3V source
61 A16 O Address bus
62 A17 O Address bus
63 A18 O Address bus
64 A19 O Address bus
65 A20 O Address bus
66 A21 O Address bus
67 A22 O Address bus
68 Vss GND
69 Vcc +3.3V source
70 A23 O Address bus
71 A24 O Address bus
72 A25 O Address bus
73 Vss (PLL) GND for PLL
74 CAP1 O Capacitor connecting terminal for PLL
75 Vcc (PLL)
+3.3V source for PLL
76 Vss GND
77 ONENB I ON Circuit enable signal BGA288
78 Vcc +3.3V source
79 EXTAL I Oscillator in (10MHz) X2
80 XTAL O Oscillator out (10MHz) X2
81 TESTMDB I Test mode control GND
82 Vss GND
83 Vcc +3.3V source
84 MD2 / RXD0 I Data input of serial port 0 BGA288
85 MD1 / TXD0 I/O Data output of serial port 0 BGA288
86 MD0 / SCK0 I/O Not used
87 BREQB I Bus request BGA288
88 RESETB I Reset signal from BGA288 BGA288
89 NMI I Non-maskable Interrupt request BGA288
90 IRL3B I Interrupt request BGA288
91 RXD1 I Data input of serial port 1 IC5(RS232C),BGA288
92 TXD1 O Data output of serial port 1 IC5(RS232C),BGA288
93 SCK1 I/O Clock of serial port 1 BGA288
94 CTS1 I Serial port 1 transmission permission IC5(RS232C)
95 RTS1 O Serial port 1 transmission request IC5(RS232C)
96 BACKB O Bus access permission BGA288
97 IOIS16B I Write protect input BGA288
98 STATUS0 O
STATUS0 si
g
nal to BGA288
BGA288
99 ONSTATUSB O V3ROM (+3.3V) ON/OFF control. H=ON BGA288,Power supply unit
100 Vss GND
101 CKIO I/O System clock I/O BGA288
102 Vcc +3.3V source
103 MD4 / CE2BB I/O PCMCIA CE2B signal BGA288
104 MD3 / CE2AB I/O PCMCIA CE2A signal BGA288
105 ONB I On circuit start request BGA288
106 RD / WRB O Read/Write signal BGA288,RAM,ROM
107 RDB O Read pulse BGA288,ROM,LCD unit
108 CS6B / CE1BB O Chip select-6 sigmal BGA288
109 CS5B / CE1AB O Chip select-5 sigmal BGA288
110 CS4B O Chip select-4 sigmal BGA288,ROM Board
111 CS3B O Not used
112 CS2B O Chip select-2 sigmal BGA288
113 CS1B O Chip select-1 sigmal ROM Board
114 CS0B O Chip select-0 sigmal ROM Board
115 Vss GND
116 Vcc +3.3V source
117 WE3B / ICIOWRB O D31-D24 select signal / IO Write BGA288
118 WE2B / ICIORDB O D23-D16 select signal / IO Read BGA288,ROM Board

Casio CASSIOPEIA A-20 Specifications

General

Brand	Casio
Model	CASSIOPEIA A-20
Category	Handhelds
Language	English