Kinetis MicrocontrollersのトピックKL27Z I2C ACK PROBLEM https://community.nxp.com/t5/Kinetis-Microcontrollers/KL27Z-I2C-ACK-PROBLEM/m-p/881983#M52307 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>I'm working on a project and i have to use an EEPROM and a KL27Z256 microcontroller.</P><P>The problem is when the slave(the EEPROM) sends the ACK bit. It only goes half way down. I've been searching about this, and i know that i have to put the SDA line in open collector. But in this microcontroller there's no register to do that.</P><P>I need information about how to do this.</P><P>Thanks</P><P>Jose Ricaurte Pino</P></BODY></HTML> Mon, 04 Feb 2019 21:43:46 GMT jricaurtepino 2019-02-04T21:43:46Z KL27Z I2C ACK PROBLEM https://community.nxp.com/t5/Kinetis-Microcontrollers/KL27Z-I2C-ACK-PROBLEM/m-p/881983#M52307 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>I'm working on a project and i have to use an EEPROM and a KL27Z256 microcontroller.</P><P>The problem is when the slave(the EEPROM) sends the ACK bit. It only goes half way down. I've been searching about this, and i know that i have to put the SDA line in open collector. But in this microcontroller there's no register to do that.</P><P>I need information about how to do this.</P><P>Thanks</P><P>Jose Ricaurte Pino</P></BODY></HTML> Mon, 04 Feb 2019 21:43:46 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL27Z-I2C-ACK-PROBLEM/m-p/881983#M52307 jricaurtepino 2019-02-04T21:43:46Z Re: KL27Z I2C ACK PROBLEM https://community.nxp.com/t5/Kinetis-Microcontrollers/KL27Z-I2C-ACK-PROBLEM/m-p/881984#M52308 <HTML><HEAD></HEAD><BODY><P>Hi Jose,</P><P>&nbsp;</P><P>You will need to set the pins as open drain using the internal pull resistor. This can be configured with the <STRONG>PORTx_PCRn </STRONG>register.</P><P>&nbsp;</P><P>Please refer to the <A href="https://www.nxp.com/docs/en/reference-manual/KL27P64M48SF6RM.pdf">reference manual</A> in section 11.7.1.</P><P>&nbsp;</P><P>Best regards,</P><P>Felipe</P></BODY></HTML> Fri, 08 Feb 2019 23:09:59 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL27Z-I2C-ACK-PROBLEM/m-p/881984#M52308 FelipeGarcia 2019-02-08T23:09:59Z