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Device Overview MC9S12G-Family
NOTE
The TEST pin must be tied to ground in all applications.
1.7.2.3
BKGD / MODC — Background Debug and Mode Pin
The BKGD/MODC pin is used as a pseudo-open-drain pin for the background debug communication. It
is used as a MCU operating mode select pin during reset. The state of this pin is latched to the MODC bit
at the rising edge of RESET. The BKGD pin has an internal pull-up device.
1.7.2.4
EXTAL, XTAL — Oscillator Signal
EXTAL and XTAL are the crystal driver and external clock signals. On reset all the device clocks are
derived from the internal reference clock. XTAL is the oscillator output.
1.7.2.5
PAD[15:0] / KWAD[15:0] — Port AD Input Pins of ADC
PAD[15:0] are general-purpose input or output signals. These signals can have a pull-up or pull-down
device selected and enabled on per signal basis. Out of reset the pull devices are disabled.
1.7.2.6
PA[7:0] — Port A I/O Signals
PA[7:0] are general-purpose input or output signals. The signals can have pull-up devices, enabled by a
single control bit for this signal group. Out of reset the pull-up devices are disabled .
1.7.2.7
PB[7:0] — Port B I/O Signals
PB[7:0] are general-purpose input or output signals. The signals can have pull-up devices, enabled by a
single control bit for this signal group. Out of reset the pull-up devices are disabled .
1.7.2.8
PC[7:0] — Port C I/O Signals
PC[7:0] are general-purpose input or output signals. The signals can have pull-up devices, enabled by a
single control bit for this signal group. Out of reset the pull-up devices are disabled .
1.7.2.9
PD[7:0] — Port D I/O Signals
PD[7:0] are general-purpose input or output signals. The signals can have pull-up device, enabled by a
single control bit for this signal group. Out of reset the pull-up devices are disabled.
1.7.2.10
PE[1:0] — Port E I/O Signals
PE[1:0] are general-purpose input or output signals. The signals can have pull-down device, enabled by a
single control bit for this signal group. Out of reset the pull-down devices are enabled.
MC9S12G Family Reference Manual, Rev.1.23
56
Freescale Semiconductor
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