Freescale Semiconductor Microcontrollers Tpd and Tpu Timing Textboxes

ICS MON08 Interface Connection
Connection Procedure
352 Microcontrollers Debugger Manual
Advanced Settings Tab
The P&E Connection Manager window’s Advanced Settings tab allows the user to set
specific protocol settings. The following is an explanation of each part of the advanced
settings tab.
Figure 13.4 P&E Connection Manager Window - Advanced Settings Tab
Tpd and Tpu Timing Textboxes
Tpu and Tpd set the power-up and power-down delay (respectively) that is observed when
power-cycling a target for entry into Monitor Mode. These settings are only valid for
devices with automatically controlled power.
Whenever power is automatically switched off, or is manually requested to be switched
off, the software waits for an amount of time equal to the Tpd delay time before
proceeding to the connection protocol. This is because a board or power supply may have
capacitance which holds the power up for a short time after the supply has been switched
off, but the supply voltage must reach less than 0.1v before it is turned back on if a Power-
On reset is to occur.
Whenever power is automatically switched on, or is manually requested to be switched on,
the software waits for an amount of time equal to the Tpu delay time before attempting to
contact the 68HC08 processor. This is to allow time not only for power to be fully
available, but to wait until any reset driver has finally released the RESET line.