Port Integration Module

HCS12 Technical Training Module 6 – Port Integration, Slide 1

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Port Integration

Module



HCS12 - Port Integration Module

On the HCS12 each port has a set of control registers (in the PIM) arranged in a similar structure where each individual I/O pin can be configured for:

• Input/output selection (Ports T,S,M,P,H,J )• Drive strength reduction• Enable and polarity of pull resistors• Interrupt enable and status flags

A standard port has the following minimum features:• Input/output selection by bit.• 5V output drive with two selectable drive strengths• 5V digital or interrupt inputs• Input with selectable pull-up or pull-down device

Optional features:• Open drain for wired-or connections (Ports S,M)• Interrupt inputs with glitch filtering (Ports P,H,J )• Interrupt polarity

Port A, B, E and K are part of the core, not part of PIM.

Port Input Registers can be used to detect overload or short circuit conditions on output pins.



HCS12 - Port Integration Module



HCS12 Input / Output

Drive current:Output High: Full Drive: 12.5mA at Vdd -.8V

Partial Drive: 1.25mA at Vdd -.8VOutput Low: Full Drive: -12.5mA at .8V Partial Drive: -1.25mA at .8V

Logic Thresholds:High: 0.65 X Vdd = 3,25V Low : 0.35 X Vdd = 1,75V

Pullup/Pulldown resistors:

Pull Enable Registers enable or disable

Polarity Select Registers control pullup or pulldown Approx. 100 uA

Wired-or mode:

Ports S and M have wired-or mode (open drain) capability



HCS12 I/O Pins

• Output Fault Detection:• Ability to read pin state of outputs via Input Registers

• Reduced drive mode:• Controlled by Reduced Drive Registers

useful for EMC on SPI lines, PWM, etc.• Unused pins on PWB design:

• Configure as output and leave open,• Leave as input and enable pullup/pulldown,• Leave as input and tie to gnd. Write data register to 0.

• Special considerations for 80 pin package:• Same die as in 112 pin package.• Floating pads on die must be input with pulldown or

output with driven to 0.• Also reference - EB386: “ Family Compatibility Considerations”

• Transient protection:• Limit short duration injection currents to +/- 25 mA

• Steady State injection currents:• Up to 2.5 mA per pin, 25 mA per pkg.



Module Routing Register:

The purpose of the Module Routing Register is to provide maximum flexibility for future derivatives of the HCS12 with a lower number of modules and lower pin count packages.

HCS12 PIM - Rerouting



Port T RegistersAddress Offset $0000 A read returns latched value when configured for output or value at the input pin when when configured as input.

PPT - Port T I/O Reg.

DDRT - Port T Direction Reg.

PTIT- Port T Input Register

RDRT - Port T Reduced Drive Reg.

PERT - Port T Pull Device Enable Reg.

PPST - Port T Polarity Select Reg.

$0002 DDRTx = 0 Pin is Input = 1 Pin is Output

$0001 Contains current pin status This register may be used to detect overload or short circuit condition on the output pin

$0003 RDRT x = 0 Pin output full drive = 1 Pin output 1/3 drive

$0004 PERTx 0 = Pull-up/down disabled 1 = Pull-up/down enabled

$0005 PPSTx 0 = Port T pin x has pull-up 1 = Port T pin x has pull-down



Port S Registers

PPS - Port S I/O Reg.

DDRS - Port S Direction Reg.

PTIS- Port S Input Reg.

RDRS - Port S Reduced Drive Reg.

PERS - Port S Pull Device Enable Reg.

PPSS - Port S Polarity Select Reg.

WOMS - Port S Wired-Or Reg.

Address Offset $0008 A read returns latched value when configured for output or value at the input pin when when configured as input.

$000A DDRS x = 0 Pin is Input = 1 Pin is Output

$0009 Contains current pin status

$000B RDRS x = 0 Pin output full drive = 1 Pin output 1/3 drive

$000C PERS x 0 = Pull-up/down disabled 1 = Pull-up/down enabled

$000D PPSS x 0 = Port S pin x has pull-up 1 = Port S pin x has pull-down

$000E PPSS x 0 = Push-pull output 1 = Open-drain output



Port M RegistersPPS - Port M I/O Reg.

DDRM - Port M Direction Reg.

PTIM- Port M Input Reg.

RDRM - Port M Reduced Drive Reg.

PERM - Port M Pull Device Enable Reg.

PPSM - Port M Polarity Select Reg.

WOMM - Port M Wired-Or Reg.


$0012 DDRM x = 0 Pin is Input = 1 Pin is Output


$0013 RDRM x = 0 Pin output full drive = 1 Pin output 1/3 drive

$0014 PERM x 0 = Pull-up/down disabled 1 = Pull-up/down enabled

$0015 PPSM x 0 = Port S pin x has pull-up 1 = Port S pin x has pull-down

$0016 PPSM x 0 = Push-pull output 1 = Open-drain output

Note: If both CAN0 and BDLC are enabled, CAN functionality takes precedence



Port P Registers Address Offset $0018 A read returns latched value when configured for output or value at the input pin when when configured as input.

$001A DDRP x = 0 Pin is Input = 1 Pin is Output


$001B RDRP x = 0 Pin output full drive = 1 Pin output 1/3 drive

$001C PERP x 0 = Pull-up/down disabled 1 = Pull-up/down enabled

$001D PPSP x 0 = Falling edge on pin x sets corresponding PIFP Flag. (Pull-up device connected) 1 = Rising edge on pin x sets corresponding PIFP flag. (Pull-down device connected)

$001E PIEP x 0= Interrupt disabled 1 = Interrupt Enabled

PTP - Port P I/O Reg.

DDRP - Port P Direction Reg.

PTIP- Port P Input Reg.

RDRP - Port P Reduced Drive Reg.

PERP - Port P Pull Device Enable Reg.

PPSP - Port P Polarity Select Reg.

PIEP - Port P Interrupt Enable Reg.

PIFP - Port P Interrupt Flag Reg.

$001F PIFP x Interrupt Flag Write ‘1’ to clear

Note: If both PWM and SPI are enabled, PWM functionality takes precedence



Port H Registers

PTH - Port H I/O Reg.

DDRH - Port H Direction Reg.

PTIH- Port H Input Reg.

RDRH - Port H Reduced Drive Reg.

PERH - Port H Pull Device Enable Reg.

PPSH - Port H Polarity Select Reg.

PIEH - Port H Interrupt Enable Reg.

PIFH - Port H Interrupt Flag Reg.


$0022 DDRH x = 0 Pin is Input = 1 Pin is Output


$0023 RDRH x = 0 Pin output full drive = 1 Pin output 1/3 drive

$0024 PERP x 0 = Pull-up/down disabled 1 = Pull-up/down enabled

$0025 PPSH x 0 = Falling edge on pin x sets corresponding PIFH Flag. (Pull-up device connected) 1 = Rising edge on pin x sets corresponding PIFH flag. (Pull-down device connected)

$0026 PIEH x 0= Interrupt disabled 1 = Interrupt Enabled

$0027 PIFH x Interrupt Flag Write ‘1’ to clear



Port J RegistersPTJ - Port J I/O Reg.

DDRJ - Port J Direction Reg.

PTIJ- Port J Input Reg.

RDRJ - Port J Reduced Drive Reg.

PERJ - Port J Pull Device Enable Reg.

PPSJ - Port J Polarity Select Reg.

PIEJ - Port J Interrupt Enable Reg.

PIFJ - Port J Interrupt Flag Reg.


$002A DDRJ x = 0 Pin is Input = 1 Pin is Output


$002B RDRJ x = 0 Pin output full drive = 1 Pin output 1/3 drive

$002C PERJ x 0 = Pull-up/down disabled 1 = Pull-up/down enabled

$002D PPSJ x 0 = Falling edge on pin x sets corresponding PIFH Flag. (Pull-up device connected) 1 = Rising edge on pin x sets corresponding PIFH flag. (Pull-down device connected)

$002E PIEJ x 0= Interrupt disabled 1 = Interrupt Enabled

$002F PIFJ x Interrupt Flag Write ‘1’ to clear

Note: If both CAN4 and IIC are enabled, CAN Functionality takes precedence



HCS12 PIM - Rerouting

Port Integration Module

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