NEC V850E/RS1 User Manual page 772

(2) Configuration of Port 9
While the OCDM0 bit is set, the corresponding pins of Port 9 are configured to the on-chip debug
mode and digital input/output cannot be performed. Also, the on-chip pull down resistor connected
to P911/ DRST is likewise controlled by the PD9 control register, but this function may not be
disabled while the OCDM0 bit is set. Clearing the OCDM0 bit to 0 has the effect of enabling the
digital I/O function on the corresponding pins of Port 9.
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Chapter 22 On-Chip Debug Function
Figure 22-3: P911/ DRST Built-in Pull Down Resistor
P911/DRST
OCDM0
Pull-down resistor
User's Manual U16702EE3V2UD00
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