Detailed Signal Descriptions; Extal, Xtal - Oscillator Pins; Reset - External Reset Pin - Motorola MC9S12DT256 User Manual

MC9S12DT256 Device User Guide — V03.07
Pin Name Pin Name
Funct. 1 Funct. 2
PP4 KWP4
PP3 KWP3
PP2 KWP2
PP1 KWP1
PP0 KWP0
PS7 SS0
PS6 SCK0
PS5 MOSI0
PS4 MISO0
PS3 TXD1
PS2 RXD1
PS1 TXD0
PS0 RXD0
PT[7:0] IOC[7:0]

2.3 Detailed Signal Descriptions

2.3.1 EXTAL, XTAL — Oscillator Pins
EXTAL and XTAL are the crystal driver and external clock pins. On reset all the device clocks are derived
from the EXTAL input frequency. XTAL is the crystal output.
2.3.2 RESET — External Reset Pin
An active low bidirectional control signal, it acts as an input to initialize the MCU to a known start-up
state, and an output when an internal MCU function causes a reset.
56
Pin Name Pin Name Pin Name
Funct. 3 Funct. 4
PWM4 MISO2
PWM3 SS1
PWM2 SCK1
PWM1 MOSI1
PWM0 MISO1
— —
— —
— —
— —
— —
— —
— —
— —
— —
Internal Pull
Power
Funct. 5 Supply
CTRL
PERP/
— VDDX
PPSP
PERP/
— VDDX
PPSP
PERP/
— VDDX
PPSP
PERP/
— VDDX
PPSP
PERP/
— VDDX
PPSP
PERS/
— VDDX
PPSS
PERS/
— VDDX
PPSS
PERS/
— VDDX
PPSS
PERS/
— VDDX
PPSS
PERS/
— VDDX
PPSS
PERS/
— VDDX
PPSS
PERS/
— VDDX
PPSS
PERS/
— VDDX
PPSS
PERT/
— VDDX
PPST
Resistor
Reset
State
Port P I/O, Interrupt, Channel 4 of
Disabled
PWM, MISO2 of SPI2
Port P I/O, Interrupt, Channel 3 of
Disabled
PWM, SS of SPI1
Port P I/O, Interrupt, Channel 2 of
Disabled
PWM, SCK of SPI1
Port P I/O, Interrupt, Channel 1 of
Disabled
PWM, MOSI of SPI1
Port P I/O, Interrupt, Channel 0 of
Disabled
PWM, MISO2 of SPI1
Up Port S I/O, SS of SPI0
Up Port S I/O, SCK of SPI0
Up Port S I/O, MOSI of SPI0
Up Port S I/O, MISO of SPI0
Up Port S I/O, TXD of SCI1
Up Port S I/O, RXD of SCI1
Up Port S I/O, TXD of SCI0
Up Port S I/O, RXD of SCI0
Disabled Port T I/O, Timer channels
Description