HP 64147A, User Manual

Page: 22 / 105

Step Command and
Interrupts
When an interrupt occurs while the emulator is running in monitor, the
emulator fails to do the first step operation. The emulator will display
the mnemonic of the instruction which should be stepped, but the
instruction is not actually executed. The second step operation will
step the first instruction of the interrupt routine.
Emulation
Commands in
Stop/Wait Mode
When the microprocessor is in the stop or wait mode, emulation
commands which access memory or registers will fail. In the case of
using M37782/83/85 emulation pod, you need to reset the emulator to
release stop or wait mode. And, in the case of using other emulation
pod, you need to break the the emulator.
RDY/HOLD Input in
Background Cycles
The 64147A M37750/51 emulator does not accept RDY/HOLD input
while in background monitor. However, when you use
M37780/81/82/83/85/95/96 emulation pod, M37750/51 emulator
accepts RDY/HOLD input while in background monitor.
Accessing External
Memory Area in SFR
When operation mode is memory expansion or microprocessor mode,
there is external memory area in SFR. However, accessing to this area
is not allowed.
High Speed Bus
Mode
Always set bus mode as low speed bus mode, when you use M37751
emulation pod. HP 64147A 7750/51 emulator does not support high
speed bus mode. Note that bus mode is automatically configured as
high speed bus mode when you do run from reset command. Then,
you need to re-configure bus mode as low speed bus mode before
accessing SFR area.
RMPA Instruction
Disassembling in trace list may not be correct for next instruction of
RMPA instruction. This failure will occur when RMPA instruction is
repeated over about fifty times.
Stack Address
In some versions of 7720 microprocessor, the stack can be located in
Bank FF. However, the HP 64147A 7750/51 Series emulator does not
support the feature. The stack must be located in Bank 0.
Evaluation Chip
Hewlett-Packard makes no warranty of the problem caused by the
Evaluation chip in the emulator.
1-8 Introduction