| 摘要 |
A multifunctional memory comprises a mask ROM (2). When an "L" level signal is applied to a control pin (EXT), data is read out from the ROM (2) in response to an address signal inputted from a multiplex pin (AD/DA). Thereafter, the data read out from the ROM (2) is outputted from the multiplex pin (AD/DA). In this case, an "H" level signal is outputted from a chip select pin ( &upbar& C). When an "H" level signal is applied to the control pin (EXT), an "L" level signal is outputted from the chip select pin ( &upbar& C). Consequently, the EPROM (30) is rendered active. In addition, the address signal inputted from the multiplex pin (AD/DA) is outputted from a port/address pin (PORT/AD). Data is read out from the EPROM (30) in response to the address signal. |
