SC515846 Ver la hoja de datos (PDF) - Freescale Semiconductor

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SC515846

HCS12 Microcontrollers

Freescale Semiconductor 

Device User Guide — 9S12DT128DGV2/D V02.16

– 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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