System Considerations
MKW01xxRM Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
4-13
•
Initialization software should assert reset and then release reset to the transceiver (MCU still
running on start-up clock)
•
The MCU clock can be switched to the OSC
•
Program transceiver to disable ClkOut
The second crystal is justified when accurate power down time periods are required. The external clock
with the 32.768 kHz crystal allows an accurate time tick for the RTC at very low power.
4.4.5
Debug Port Pin Descriptions
The debug port pins default after POR to their SWD functionality.
4.5
MKW01Z128 GPIO (Mixed I/O from Transceiver and MCU)
The MKW01Z128 SiP supports a total of 43 GPIO pins that originate from the transceiver and/or the
MCU:
•
The transceiver provides six pins (DIO5-DIO0) that can be programmed as status -
— Use of the DIOX are programmed as listed in
— DIO1 and DIO0 are connected internally to MCU GPIOs, PTE3, PTE2, as well as routed to
package pins. Enhanced performance can be achieved by routing them externally to other
GPIO pins, PTC4 and PTC3.
— Freescale software commonly uses DIO4 externally connected to PTD4.
— DIO5 is also ClkOUT and most commonly externally connected to EXTAL0 for the MCU
clock source
— DIO2 often used for DATA out, in conjuction with DIO1 DCLK.
— DIO3 is uncommitted.
•
Four-signal SPI Bus port connected internally and reserved for MCU and transceiver use. On
bottom pins 57–60. (PTC7, PTD0, PTC5, PTC6)
•
PTE30 is typically used to drive the RESET on the transceiver.
•
PTA1 and PTA2 are used for UART0 RXD & TXD.
•
PTC1 and PTC2 are typically used for I2C.
•
PTE17 is used as a software PN output for testing in some Freescale applications.
— If a crystal is used with the MCU, PTA19/XTAL0 and PTA18/EXTAL0 pins cannot be used as
GPIO. These are available only using the internal clock reference.
Table 4-4. Serial wire debug pin description
Pin Name
Type
Description
SWD_CLK
Input
Serial wire clock. This pin is the clock for debug logic when in the Serial Wire
Debug mode. This pin is pulled down internally.
SWD_DIO
Input/Output
Serial wire debug data input/output. This pin is used by an external debug
tool for communication and device control. This pin is pulled up internally.
Содержание MKW01Z128
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