Hi I am having issues with voltage levels on pins p1.4-p1.7 on a seehau emulator with c51 pod. My target is NXP 8051 based CMOS microcontroller with 32 I/O Lines, 3 Timers/Counters, 6 Interrupts/4 Priority Levels, ROMless, 128 Bytes On-chip RAM.
Without the emulator, when I plug in the NXP microcontroller, and flashed eeprom, I get about 2.1-2.3V on those pins, and the target functions correclty. when I use the emulator those voltages are at 1.8V not wnough for target to function correclty. Im using the scope to measure them. Pod is setup for external crystal and internal power. Vcc is at 5.1v in both cases with emulator and with microcontroller/eeprom. Any ideas on where to start troubleshooting? I guess it might have something to do with jumper settings on that pod but the user guise is not that detailed.
the belief that a 'high' from a standard '51 has any oomph has been the bane of many design attempts.