Hi John
Yes, pull-ups are valid for the UART input functions.
In the uTasker project it is done with
_CONFIG_PERIPHERAL(D, 2, (PD_2_UART2_RX | UART_PULL_UPS)); // UART2_RX on PD2 (alt. function 3)
and
_CONFIG_PERIPHERAL(C, 14, (PC_14_UART4_RX | UART_PULL_UPS)); // UART4_RX on PC14 (alt. function 3)
Otherwise you just need to set the PORTD_PCR2 and PORTC_PCR14 registers to have their ALT fields set to 3 and their pulls polarity and enable to 0x03.
Pull-ups on the UART inputs ensures that they don't float in low power modes, which can otherwise cause higher than expected current consumption.
Regards
Mark
Complete K60 solutions, training and support:http://www.utasker.com/kinetis.html
Kinetis K60:
- http://www.utasker.com/kinetis/TWR-K60N512.html
- http://www.utasker.com/kinetis/TWR-K60D100M.html
- http://www.utasker.com/kinetis/TWR-K60F120M.html
- http://www.utasker.com/kinetis/ELZET80_NET-KBED.html
- http://www.utasker.com/kinetis/ELZET80_NET-K60.html
