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 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

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.

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.

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 $0000 A read returns latched value when configured for output or value at the input pin when when configured as input. $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. Address Offset $0008 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

Port M Registers PPS - Port M I/O Reg. DDRM - Port M Direction Reg. Address Offset $0010 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 $0012 DDRM x = 0 Pin is Input = 1 Pin is Output $0011 Contains current pin status $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

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

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. $0022 DDRH x = 0 Pin is Input = 1 Pin is Output $0021 Contains current pin status $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 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

HCS12 PIM - Rerouting