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Casio CASSIOPEIA A-20 Service Manual & Parts List page 33

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Getting started manual (23 pages)

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Getting started manual (23 pages)

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Getting started (23 pages)

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N o .

Pin Name

V o l t

182

LOCK

3V

183

MEMCLB

3V

184

A25

3V

185

A24

3V

186

A23

3V

187

A22

3V

188

A21

3V

189

A20

3V

190

A19

3V

191

A18

3V

192

A17

3V

193

A16

3V

194

A15

3V

195

A14

3V

196

A13

3V

197

A12

3V

198

A11

3V

199

A10

3V

200

A9

3V

201

A8

3V

202

A7

3V

203

VSS

204

A6

3V

205

A5

3V

206

A4

3V

207

VDD2

3V

208

A3

3V

209

A2

3V

210

A1

3V

211

A0

3V

212

D0

3V

213

D1

3V

214

D2

3V

215

D3

3V

216

D4

3V

217

D5

3V

218

VDD2

3V

219

VSS

220

D6

3V

221

D7

3V

222

D8

3V

223

D9

3V

224

D10

3V

225

D11

3V

226

D12

3V

227

D13

3V

228

D14

3V

229

D15

3V

230

MCLOCK

3V

231

ONENB

3V

232

RXD0

3V

233

TXD0

3V

234

BREQB

3V

235

RESETB

3V

236

VSS

237

IRQB

3V

238

RXDSH

3V

239

TXDSH

3V

240

SCK

3V

241

BACKB

3V

242

IOIS16B

3V

I o / O u t

I

Not used

I

Not used

I

Address bus

I

Address bus

I/O

Address bus

I/O

Address bus

I/O

Address bus

I/O

Address bus

I

Address bus

I

Address bus

I

Address bus

I

Address bus

I

Address bus

I

Address bus

I

Address bus

I

Address bus

I/O

Address bus

I/O

Address bus

I/O

Address bus

I/O

Address bus

I/O

Address bus

GND

I/O

Address bus

I/O

Address bus

I/O

Address bus

+3V source

I/O

Address bus

I/O

Address bus

I

Address bus

I

Address bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

+3V source

GND

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I/O

Data bus

I

CKIO signal from CPU

O

ON Circuit enable signal

O

Data output of serial port 0

I

Data input of serial port 0

O

REQ signal to CPU

O

RESET signal to CPU

GND

O

IRQ signal to CPU

I/O

Data output of signal port 1

I

Data input of serial port 1

O

Clock of serial port 1

I

Bus access permission from CPU

O

Write protect signal to CPU

— 30 —

Function

To/From

IC1

IC1

IC1

IC1

IC1

IC1

IC1

IC5(RS232C),BGA288

BGA288

IC1

IC1

IC1

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