Debugging Notes - Oki Dr.63514 User Manual

Chapter 4. Additional Usage Notes

1. Debugging Notes

(1) Power on/off sequence
When a user application system is connected, always power up the emulator and then the user
application system. Power down in the reverse order.
(2) Flag bits and start/stop addresses
Only breakpoint, trace enable, and sync out bit and start and stop address specifications corresponding
to the first word of an instruction produce results. One specifying the second word of a two-word
instruction or an entry in the ROM table is ignored.
(3) Terminating halt mode
A user break terminates halt mode if it is in effect. Restarting real-time emulation without specifying a
starting address causes execution to resume from the instruction after the HALT instruction. Note that
forcing resumption this way can produce different results from normal execution.
(4) User cable pins
In the Dr.63514 in-circuit emulator, the user-cable I/O pins have the following I/O circuits, and as a
result, their I/O characteristics differ from the corresponding pins in the ML63512/514.
1. VDD,VSS terminal
The pins on the Dr.63514 in-circuit emulator user cable operate at the voltage level between the VDD
(note 1) and the VSS pins. Either the emulator internal power supply (1.5 V) or an external power supply
(input from the user cable USR.VDD pin) can be used for VDD. When using an external power supply,
apply the desired operating voltage to the USR.VDD pin.
USR.VDD
(User cable)
1.5V
(Internal power
supply voltage)
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n Note 1 n
The term VDD used in this document refers to the voltage on the pins in the user cable as
selected by the VDD.SEL switch.
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Caution
4-2
Protection
circuit
Figure 4-1 VDD circuit
The voltage supplied to the USR.VDD pin must be
within the stipulated range (0.9 to 5.5 V). The Dr.63514
in-circuit emulator may be damaged or destroyed if a
voltage outside the stipulated range is applied, or if no
voltage is applied.
EXT
VDD.SEL
SW
IN
VDD