MC9S12DT128 Datasheet, PDF (22/142 Pages) Freescale Semiconductor, Inc – Device User Guide

Device User Guide — 9S12DT128DGV2/D V02.15
– Port H
In order to avoid floating nodes the ports should be either configured as outputs by setting the
data direction register (DDRH at Base+$0262) to $FF, or enabling the pull resistors by writing
a $FF to the pull enable register (PERH at Base+$0264).
– Port J[1:0]
Port J pull-up resistors are enabled out of reset on all four pins (7:6 and 1:0). Therefore care must
be taken not to disable the pull enables on PJ[1:0] by clearing the bits PERJ1 and PERJ0 at
Base+$026C.
– Port K
Port K pull-up resistors are enabled out of reset, i.e. Bit 7 = PUKE = 1 in the register PUCR at
Base+$000C. Therefore care must be taken not to clear this bit.
– Port M[7:6]
PM7:6 must be configured as outputs or their pull resistors must be enabled to avoid floating
inputs.
– Port P6
PP6 must be configured as output or its pull resistor must be enabled to avoid a floating input.
– Port S[7:4]
PS7:4 must be configured as outputs or their pull resistors must be enabled to avoid floating
inputs.
– PAD[15:8] (ATD1 channels)
Out of reset the ATD1 is disabled preventing current flows in the pins. Do not modify the ATD1
registers!
• Pins not available in 80 pin QFP package for MC9S12DB128, SC515846, and SC102202
– Port H
In order to avoid floating nodes the ports should be either configured as outputs by setting the
data direction register (DDRH at Base+$0262) to $FF, or enabling the pull resistors by writing
a $FF to the pull enable register (PERH at Base+$0264).
– Port J[7:6, 1:0]
Port J pull-up resistors are enabled out of reset on all four pins (7:6 and 1:0). Therefore care must
be taken not to disable the pull enables on PJ[7:6, 1:0] by clearing the bits PERJ7, PERJ6,
PERJ1 and PERJ0 at Base+$026C.
– Port K
Port K pull-up resistors are enabled out of reset, i.e. Bit 7 = PUKE = 1 in the register PUCR at
Base+$000C. Therefore care must be taken not to clear this bit.
– Port M[1:0]
PM1:0 must be configured as outputs or their pull resistors must be enabled to avoid floating
inputs.
– Port P6
PP6 must be configured as output or its pull resistor must be enabled to avoid a floating input.
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