Device Overview MC9S12P-Family
1.7.3.10 PE4 / ECLK — Port E I/O Pin 4
PE4 is a general-purpose input or output pin. It can be configured to drive the internal bus clock ECLK.
ECLK can be used as a timing reference. The ECLK output has a programmable prescaler.
1.7.3.11 PE[3:2] — Port E I/O Pin 3
PE[3:2] are a general-purpose input or output pins.
1.7.3.12 PE1 / IRQ — Port E Input Pin 1
PE1 is a general-purpose input pin and the maskable interrupt request input that provides a means of
applying asynchronous interrupt requests. This will wake up the MCU from stop or wait mode.
1.7.3.13 PE0 / XIRQ — Port E Input Pin 0
PE0 is a general-purpose input pin and the non-maskable interrupt request input that provides a means of
applying asynchronous interrupt requests. This will wake up the MCU from stop or wait mode. The XIRQ
interrupt is level sensitive and active low. As XIRQ is level sensitive, while this pin is low the MCU will
not enter STOP mode.
1.7.3.14 PJ[7:6, 2:0] / KWJ[7:6, 2:0] — Port J I/O Pins 7-6, 2-0
PJ[7:6, 2:0] are a general-purpose input or output pins. They can be configured as keypad wakeup inputs.
1.7.3.15 PM[7:6] — Port M I/O Pins 7-6
PM[7:6] are a general-purpose input or output pins.
1.7.3.16 PM5 / SCK — Port M I/O Pin 5
PM5 is a general-purpose input or output pin. It can be configured as the serial clock pin SCK of the serial
peripheral interface (SPI).
1.7.3.17 PM4 / MOSI — Port M I/O Pin 4
PM4 is a general-purpose input or output pin. It can be configured as the master output (during master
mode) or slave input pin (during slave mode) MOSI for the serial peripheral interface (SPI).
1.7.3.18 PM3 / SS — Port M I/O Pin 3
PM3 is a general-purpose input or output pin.It can be configured as the slave select pin SS of the serial
peripheral interface (SPI).
1.7.3.19 PM2 / MISO— Port M I/O Pin 3
PM2 is a general-purpose input or output pin. It can be configured as the master input (during master
mode) or slave output pin (during slave mode) MISO for the serial peripheral interface (SPI)
S12P-Family Reference Manual, Rev. 1.13
Freescale Semiconductor
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