mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 62

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 1 Device Overview MC9S12XD-Family
1.2.3.40
PK7 is a general-purpose input or output pin. During MCU emulation modes and normal expanded modes
of operation, this pin is used to enable the Flash EEPROM memory in the memory map (ROMCTL). At
the rising edge of RESET, the state of this pin is latched to the ROMON bit. The EWAIT input signal
maintains the external bus access until the external device is ready to capture data (write) or provide data
(read).
The input voltage threshold for PK7 can be configured to reduced levels, to allow data from an external
3.3-V peripheral to be read by the MCU operating at 5.0 V. The input voltage threshold for PK7 is
configured to reduced levels out of reset in expanded and emulation modes.
1.2.3.41
PK[6:4] are general-purpose input or output pins. During MCU expanded modes of operation, the
ACC[2:0] signals are used to indicate the access source of the bus cycle. This pins also provide the
expanded addresses ADDR[22:20] for the external bus. In Emulation modes ACC[2:0] is available and is
time multiplexed with the high addresses
1.2.3.42
PK3-PK0 are general-purpose input or output pins. In MCU expanded modes of operation, these pins
provide the expanded address ADDR[19:16] for the external bus and carry instruction pipe information.
1.2.3.43
PK7 and PK[5:0] are general-purpose input or output pins.
1.2.3.44
PM7 is a general-purpose input or output pin. It can be configured as the transmit pin TXCAN of the
scalable controller area network controller 3 or 4 (CAN3 or CAN4). PM7 can be configured as the transmit
pin TXD3 of the serial communication interface 3 (SCI3).
1.2.3.45
PM6 is a general-purpose input or output pin. It can be configured as the receive pin RXCAN of the
scalable controller area network controller 3 or 4 (CAN3 or CAN4). PM6 can be configured as the receive
pin RXD3 of the serial communication interface 3 (SCI3).
1.2.3.46
PM5 is a general-purpose input or output pin. It can be configured as the transmit pin TXCAN of the
scalable controller area network controllers 0, 2 or 4 (CAN0, CAN2, or CAN4). It can be configured as
the serial clock pin SCK of the serial peripheral interface 0 (SPI0).
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PK7 / EWAIT / ROMCTL — Port K I/O Pin 7
PK[6:4] / ADDR[22:20] / ACC[2:0] — Port K I/O Pin [6:4]
PK[3:0] / ADDR[19:16] / IQSTAT[3:0] — Port K I/O Pins [3:0]
PK7,PK[5:0] — Port K I/O Pins 7 & [5:0]
PM7 / TXCAN3 / TXCAN4 / TXD3 — Port M I/O Pin 7
PM6 / RXCAN3 / RXCAN4 / RXD3 — Port M I/O Pin 6
PM5 / TXCAN0 / TXCAN2 / TXCAN4 / SCK0 — Port M I/O Pin 5
MC9S12XDP512 Data Sheet, Rev. 2.17
Freescale Semiconductor