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| projects:hi-pi [2017/03/21 04:46] – [Appendix] darron | projects:hi-pi [2017/03/23 05:34] (current) – [Appendix] darron | ||
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| to reset a device which has low voltage programming mode disabled in its | to reset a device which has low voltage programming mode disabled in its | ||
| configuration bits. | configuration bits. | ||
| + | |||
| + | === News === | ||
| + | |||
| + | A bug may occur with this circuit in certain situations, please refer to the | ||
| + | appendix. | ||
| Line 118: | Line 123: | ||
| === Appendix === | === Appendix === | ||
| + | |||
| + | Thanks must go to Tomas Lorenc who has notified me a fix is required | ||
| + | for devices which have MCLR configured as an I/O. In this situation | ||
| + | a device is not brought out of reset and into programming mode due to VDD | ||
| + | being raised first. Here he presents a fix for this situation. | ||
| {{: | {{: | ||
| + | |||
| + | For example, the PIC12F675 has this feature in it's configuration word. | ||
| + | |||
| + | < | ||
| + | bit5 | ||
| + | MCLRE: GP3/MCLR Pin Function Select bit(5) | ||
| + | 1 = GP3/MCLR pin function is MCLR | ||
| + | 0 = GP3/MCLR pin function is digital I/O, MCLR internally tied to VDD | ||
| + | </ | ||
| + | |||
| + | |||
