Datasheet

M16C

Target Setup for the FoUSB Programme

REU05B0059-0101Z March 2004

Page 4 of 7

This pin may be used for other applications as long as the user ensures that the ICD can drive the pin to valid

levels with 5mA current.

3.4 RXD –Target MCU Receive Data Input Signal (ICD Transmit Data Output Signal)

This is the ICD SIO transmit data output. This must be connected to the target MCU’s boot UART/SIO receive

data input (RXD) pin.

This pin may be used for other applications as long as the user ensures that the ICD can drive the pin to valid

levels with 5mA current.

3.5 CE Pin

This pin is used to enter boot mode for programming of the target M16C MCU. Not all M16C MCU’s have a CE

pin. If a CE pin exists on the target MCU, it should be connected to this pin (refer to serial mode flash

programming in the target MCU’s datasheet). If not, leave pin unconnected.

If the target MCU’s CE pin is used as input, isolate the driving circuit from the header connection with a 1Kohm

resistor.

If to be left unconnected (if users decides to), care must be taken to ensure that the target MCU’s CE pin has a

high signal level using a pull-up resistor during any programming operations.

3.6 EPM Pin (in Target Power Mode)

In Target Power Mode, the pin is used to control target MCU’s EPM pin (if it exists on the target MCU). EPM pin

is used during programming of the target MCU. If this pin exists on the target MCU, it should be connected to the

header (refer to serial mode flash programming of the target MCU’s datasheet). If not, leave unconnected.

If the target MCU’s EPM pin is used as input, isolate the driving circuit from the header connection with a 1Kohm

resistor.

If the EPM pin of the M16C MCU is left unconnected (no external circuit and not connected to 10-pin header),

care must be taken to ensure that the target MCU’s EPM pin has a high signal level by a pull-up resistor during

any programming operations.

3.7 GND – Ground Pin

This provides the common point where the ICD ground and target board ground planes can be connected. This

must be connected to target board’s GND line/plane.

3.8 RESET – Target MCU Reset Signal

This active low signal is used by the ICD to reset the target MCU. This must be connected to the target board’s

reset circuit or target MCU’s reset pin.

The user must ensure that the ICD can drive the pin to a valid low level with 5mA current.