| 摘要 |
<p>PURPOSE:To surely reset a microprocessor CPU by storing the state of a three point changeover switch in a resetting state and reading a detection signal to compare it with the stored switch state in an interruption state. CONSTITUTION:An information processor consists of a CPU 1, a program ROM, a RAM 3, an internal ROM 4, an external ROM 5 that can be freely attached and detached via connectors 6a-6b, a display drive circuit 7, a display device 8, a key matrix circuit 9 for an input means, a timer circuit 10, a gate circuit 11, a three point changeover slide switch 12, a stabilized power supply circuit 15 containing a DC/DC converter 18, a resetting signal generating circuit 19, and a switch state detecting circuit 20. The CPU 1 supplies a resetting signal R to the CPU 1 as well as a detecting signal S and also supplies the output of the circuit 10 to an NMI (non-maskable interruption) terminal for application of an interruption. As a result, the CPU 1 is surely reset when a memory circuit is switched.</p> |
