Datasheet

V850ES/JG3 CHAPTER 28 ON-CHIP DEBUG FUNCTION
R01UH0015EJ0300 Rev.3.00 Page 758 of 870
Sep 30, 2010
(5) Securement of communication serial interface
UARTA0, CSIB0, or CSIB3 is used for communication between MINICUBE2 and the target system. The settings
related to the serial interface modes are performed by the debug monitor program, but if the setting is changed by
the user program, a communication error may occur.
To prevent such a problem from occurring, communication serial interface must be secured in the user program.
[How to secure communication serial interface]
• On-chip debug mode register (OCDM)
For the on-chip debug function using the UARTA0, CSIB0, or CSIB3, set the OCDM register functions to normal
mode. Be sure to set as follows.
• Input low level to the P05/INTP2/DRST pin.
• Set the OCDM0 bit as shown below.
<1> Clear the OCDM0 bit to 0.
<2> Fix the P05/INTP2/DRST pin input to low level until the processing of <1> is complete.
• Serial interface registers
Do not set the registers related to CSIB0, CSIB3, or UARTA0 in the user program.
• Interrupt mask register
When CSIB0 is used, do not mask the transmit end interrupt (INTCB0R). When CSIB3 is used, do not mask the
transmit end interrupt (INTCB3R). When UARTA0 is used, do not mask the receive end interrupt (INTUA0R).
(a) When CSIB0 is used
×
CB0RIC
0 ×× ××
××
6543210
7
(b) When CSIB3 is used
×
CB3RIC
0 ××××
××
6543210
7
(C) When UARTA0 is used
×
UA0RIC
0 ××××
××
6543210
7
Remark ×: don’t care