Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 32 ON-CHIP DEBUG FUNCTION
R01UH0042EJ0500 Rev.5.00 Page 1389 of 1513
Aug 12, 2011
32.1 Debugging with DCU
Programs can be debugged using the debug interface pins (DRST, DCK, DMS, DDI, and DDO) to connect the on-chip
debug emulator (MINICUBE).
32.1.1 Connection circuit example
Figure 32-1. Circuit Connection Example When Debug Interface Pins Are Used for Communication Interface
MINICUBE V850ES/JG3-H,
V850ES/JH3-H
VDD
DCK
DMS
DDI
DDO
DRST
RESET
FLMD0
GND
EV
DD
DCK
DMS
DDI
DDO
DRST
Note 2
RESET
FLMD0
Note 3
FLMD1/PDL5
V
SS
Note 1
STATUS
TARGET
POWER
Notes 1. Example of pin connection when MINICUBE is not connected
2. A pull-down resistor is provided on chip.
3. For flash memory rewriting
32.1.2 Interface signals
The interface signals are described below.
(1) DRST
This is a reset input signal for the on-chip debug unit. It is a negative-logic signal that asynchronously initializes
the debug control unit.
MINICUBE raises the DRST signal when it detects V
DD of the target system after the integrated debugger is started,
and starts the on-chip debug unit of the device.
When the DRST signal goes high, a reset signal is also generated in the CPU.
When starting debugging by starting the integrated debugger, a CPU reset is always generated.