1. Port Integration Module

2. 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.

3. HCS12 - Port Integration Module

4. HCS12 Input / Output Logic Thresholds: High: 0.65 X Vdd = 3,25V
Low : 0.35 X Vdd = 1,75V
Drive current:
Output High: Full Drive: 12.5mA at Vdd -.8V
Partial Drive: 1.25mA at Vdd -.8V
Output Low: Full Drive: -12.5mA at .8V
Partial Drive: -1.25mA at .8V
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

5. 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.
Note: Power supply must maintain regulation within operating VDD or VDDX range during instantaneous and operating maximum current conditions. If positive injection current (Vin > VDD or Vin > VDDX) is greater than IDD or IDDX, the injection current may flow out of VDD/VDDX and could result in external power supply going out of regulation. Insure external VDD/VDDX load will shunt current greater than maximum injection current. This will be the greatest risk when the MCU is not consuming power. Examples are: if no system clock is present, or if clock rate is very low which would reduce overall power consumption.

6. HCS12 PIM - Rerouting
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.

7. Port T Registers 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.
Address Offset
$ A read returns latched value
when configured for output
or value at the input pin when
when configured as input.
$ 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
$ RDRT x
= 0 Pin output full drive
= 1 Pin output 1/3 drive
$ PERTx
0 = Pull-up/down disabled
1 = Pull-up/down enabled
$ PPSTx
0 = Port T pin x has pull-up
1 = Port T pin x has pull-down

8. Port S Registers PPS - Port S I/O Reg. DDRS - Port S Direction Reg.
Address Offset
$ A read returns latched value
when configured for output
or value at the input pin when
when configured as input.
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.
$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

9. Port M Registers PPS - Port M I/O Reg. DDRM - Port M Direction Reg.
Address Offset
$ A read returns latched value
when configured for output
or value at the input pin when
when configured as input.
PPS - 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.
Note: If both CAN0 and BDLC are enabled,
CAN functionality takes precedence
$ DDRM x
= 0 Pin is Input
= 1 Pin is Output
$0011
Contains current pin status
$ RDRM x
= 0 Pin output full drive
= 1 Pin output 1/3 drive
$ PERM x
0 = Pull-up/down disabled
1 = Pull-up/down enabled
$ PPSM x
0 = Port S pin x has pull-up
1 = Port S pin x has pull-down
$ PPSM x
0 = Push-pull output
1 = Open-drain output

10. 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.
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
PIFP - Port P Interrupt
Flag Reg.
Note: If both PWM and SPI are enabled,
PWM functionality takes precedence
$001A DDRP x
= 0 Pin is Input
= 1 Pin is Output
$0019
Contains current pin status
$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
$001F PIFP x Interrupt Flag
Write ‘1’ to clear

11. Port H Registers Address Offset $0020 A read returns latched value
when configured for output
or value at the input pin when
when configured as input.
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
PIFH - Port H Interrupt
Flag Reg.
$ DDRH x
= 0 Pin is Input
= 1 Pin is Output
$0021
Contains current pin status
$ RDRH x
= 0 Pin output full drive
= 1 Pin output 1/3 drive
$ PERP x
0 = Pull-up/down disabled
1 = Pull-up/down enabled
$ 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)
$ PIEH x
0= Interrupt disabled
1 = Interrupt Enabled
$ PIFH x Interrupt Flag
Write ‘1’ to clear

12. Port J Registers Address Offset $0028 A read returns latched value
when configured for output
or value at the input pin when
when configured as input.
PTJ - 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
PIFJ - Port J Interrupt
Flag Reg.
Note: If both CAN4 and IIC are enabled,
CAN Functionality takes precedence
$002A DDRJ x
= 0 Pin is Input
= 1 Pin is Output
$0029
Contains current pin status
$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

13. HCS12 PIM - Rerouting