MC3S12RG128 Datasheet, PDF (139/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Multiplexed External Bus Interface (MEBIV3) Block Description
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.
MC3S12RG128 Data Sheet, Rev. 1.05
Freescale Semiconductor
139