MC9S12T64 Datasheet, PDF (67/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Pinout and Signal Description
Signal Descriptions
The XCLKS input controls whether a crystal in combination with the
internal Colpitts oscillator is used or whether Pierce oscillator/external
clock circuitry is used. The state of this pin is latched at the rising edge
of RESET. If the input is a logic low, Pierce oscillator/external clock
circuit is configured on the EXTAL and XTAL pins. If the input is a logic
high, the Colpitts oscillator circuit is configured on EXTAL and XTAL.
Since this pin is an input with a pull-up device, if the pin is left floating,
the default configuration is the Colpitts oscillator circuit on EXTAL and
XTAL.
PE6 / MODB /
IPIPE1 — Port E I/O
Pin 6
PE6 is a general purpose input or output pin. It is used as a MCU
operating mode select pin during reset. The state of this pin is latched to
the MODB bit at the rising edge of RESET. This pin is shared with the
instruction queue tracking signal IPIPE1. This pin is an input with a
pull-down device which is only active when RESET is low.
PE5 / MODA /
IPIPE0 — Port E I/O
Pin 5
PE5 is a general purpose input or output pin. It is used as a MCU
operating mode select pin during reset. The state of this pin is latched to
the MODA bit at the rising edge of RESET. This pin is shared with the
instruction queue tracking signal IPIPE0. This pin is an input with a
pull-down device which is only active when RESET is low.
PE4 / ECLK — Port E PE4 is a general purpose input or output pin. It can be configured to drive
I/O Pin 4
the internal bus clock ECLK. ECLK can be used as a timing reference.
PE3 / LSTRB /
TAGLO — Port E
I/O Pin 3
PE3 is a general purpose input or output pin. In MCU expanded modes
of operation, LSTRB can be used for the low-byte strobe function to
indicate the type of bus access and when instruction tagging is on,
TAGLO is used to tag the low half of the instruction word being read into
the instruction queue.
PE2 / R/W — Port E
I/O Pin 2
PE2 is a general purpose input or output pin. In MCU expanded modes
of operations, this pin drives the read/write output signal for the external
bus. It indicates the direction of data on the external bus.
Pinout and Signal Description
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MC9S12T64Revision 1.1.1