| 摘要 |
PURPOSE:To attain applications for various purpose with a low cost for a one- chip microcomputer by using a sheet of glass mask to perform selection among a piezobuzzer direct drive system, a latch output system and an alarm output system. CONSTITUTION:An alarm signal 7 is supplied to an output driver 11, and at the same time a latch output signal 8 is supplied to an output driver 12 via a selection switch 9 using a glass mask. While the signal 7 is supplied to the driver 12 via an inverter 10 and the switch 9. A piezobuzzer direct drive system and latch output and alarm output systems are obtained by connecting the switch 9 to the inverter 10 and to the side of the signal 8, respectively. |
