MC9S12KG128_10 Datasheet, PDF (522/606 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 18 Multiplexed External Bus Interface (MEBIV3)
NOTE
To ensure that you read the value present on the PORTB pins, always wait
at least one cycle after writing to the DDRB register before reading from the
PORTB register.
MC9S12KG128 Data Sheet, Rev. 1.16
522
Freescale Semiconductor