33889 datasheet(29/60 Pages) FREESCALE

29 / 60 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33889

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Step 5) Write to the MCR register normal debug (0001

x101), stand-by debug (0001 x110), or Stop debug (0001

x111)

While in debug mode, the SBC can be used without

having to clear the W/D on a regular basis to facilitate

software and hardware debugging.

Step 6) To leave the debug mode, write 0000 to the MCR

To avoid entering the debug mode after a power up, first

read the BATFAIL bit (MCR read) and write 0000 into the

MCR.

Figure 11 illustrates entering the debug mode.

Figure 11. Debug Mode Enter

MCU FLASH PROGRAMMING CONFIGURATION

To facilitate the possibility of down loading software into

the application memory (MCU EEPROM or Flash), the SBC

allows the following capabilities: The VDD1 can be forced by

an external power supply to 5.0 V and the reset and WDOG

output by external signal sources to zero or 5.0 V without

damage. This supplies the complete application board with

external power supply and applies the correct signal to the

reset pin.

VSUP

SPI

MCR(step4)

BATFAIL

VDD1

debug mode

MCR (step5)

SPI: read batfail

MCR (step6)

SBC in debug Mode, no W/D

SBC not in debug Mode and W/D on

TIM1(step 3)

33889 Datasheet(PDF) 29 Page - Freescale Semiconductor, Inc