Microcomputer system using repeated reset to enter different operating modes and method to do the same

A method of entering a microcomputer system into an operating mode using a repeated reset operation, the microcomputer having a plurality of predetermined specific values corresponding to a plurality of abnormal operating modes, comprising the steps of:

• (i) checking a dedicated address of the memory after power-on reset or manual reset, wherein, if a predetermined specific value is present, indicating that the microcomputer system is in a repeated reset, setting the microcomputer system into the abnormal operating mode corresponding to the predetermined specific value;
• (ii) writing the plurality of predetermined specific values in sequence in the dedicated address of the memory, wherein an echo message is displayed after each writing operation, and a predetermined waiting time is interposed after each writing operation, wherein if the system is reset during the predetermined waiting time, returning to step (i);
• (iii) clearing the content of the dedicated address and the echo message if the system is not reset during the plurality of predetermined waiting times;
• and
• (iv) checking if an abnormal operating mode is set in the microcomputer in response to one the predetermined specific values;
• if yes, the microcomputer enters into the respective abnormal operating mode;
• if not, the microcomputer enters a normal operating mode directly.

A method of setting the operating mode of a microcomputer system using a repeated reset operation comprising the steps of:

• (i) checking a specific memory area or the specific register in the microcomputer, wherein, if a value other than a first value is present in either the specific memory area or in the microcomputer register, writing the first value into the memory area or the register, and then going to step (iv);
• (ii) checking whether a non-first reset flag is set;
• (iii) checking a dedicated address of the memory;
• (iv) if a non-first reset flag is not set and a predetermined single second specific value is not present in the dedicated address, displaying a specific pattern;
• if a non-first reset flag is not set and a single second specific value is present in a dedicated address, setting the non-fist reset flag and displaying a specific pattern;
• if a non-first reset flag is set and one of a predetermined plurality of specific values corresponding to a plurality of operating mode is present, setting the corresponding operating mode and displaying an echo message;
• and
• (v) if an abnormal mode is set, entering the corresponding operating mode;
• if not, clearing the non-first reset flag and entering a normal operating mode.

A microcomputer system utilizing a repeated reset operation to set an operating mode, comprising:

• a microcomputer;
• a memory connected to the microcomputer;
• a reset key to reset the microcomputer system;
• and
• a reset circuit to provide a power on reset pulse required in the microcomputer system or to receive the reset pulse produced by reset key;
• wherein, the microcomputer system checks a dedicated address content in the memory, and if a specific value is present, the microcomputer system is set to a first operating mode, and if a specific value is not present, the microcomputer system writes the specific value into the dedicated address in the memory and waits for a predetermined time, wherein the microcomputer is set to a second operating mode if the microcomputer system is not reset within the predetermined waiting time.