X51 V1.1
Description:
X51, MON51, and MINI51 are a set of universal monitors for the 8051 series
of microcontrollers. They provide versatile commands to access all
components of the system.
The full version X51 needs at least 32 Kbytes ROM, for smaller systems you
may use MON51 at 8 Kbytes or MINI51 at 4 Kbytes. The latter don't have the
specialized commands for non-standard 8051.
Download:
x51.zip Archive with sources, documentations, and
binaries, 129KB.
Requirements:
- Power supply works for microcontroller, (EP)ROM, and any additionally
needed circuitry.
- Working clock of the microcontroller.
- All address and data bus lines are OK.
- Access to the serial interface, connected to a terminal or a PC running
a terminal program.
Automatic baud rate recognition:
After the reset the monitor waits for two characters on the serial line.
The first one is used to find out the baud rate, so its LSBit has to be
"1" e. g. CR. The monitor expects the second character to be CR
to ensure that it found out the correct baud rate. If this condition is
met, the monitor sends:
Welcome to X51 V1.1!
Enter "HE" for help.
By rule of thumb use low baudrates at low clock frequencies and vice versa.
Common commands:
| Command |
Description |
MINI51 |
MON51 |
X51 |
| HE | shows help text | X | X | X |
| TYt | select type | - | - | X |
| RS | soft reset | X | X | X |
| FMb | calculate crystal frequency | X | X | X |
| DLt | delay | X | - | - |
| SOa,d | write sfr byte | - | X | X |
| SIa | read sfr byte | - | X | X |
| SSa,d | set sfr bit | - | X | X |
| STa | test sfr bit | - | X | X |
| XWa,d | write external memory, autoinc | X | X | X |
| XRa | read external memory, autoinc | X | X | X |
| XOa,d | write external memory | X | X | X |
| XIa | read external memory | X | X | X |
| XPb,e | prepare external memory for test | X | X | X |
| XTb,e | test external memory | X | X | X |
| MHa | measure high pulse | - | X | X |
| MLa | measure low pulse | - | X | X |
| OHa,t | high pulse output | - | X | X |
| OLa,t | low pulse output | - | X | X |
| POp,d | write port | X | - | X |
| PIp | read port | X | - | X |
| 0I | idle mode (80Cxx only) | X | - | X |
| 0S | power down mode (80Cxx only) | X | - | X |
Special commands in X51:
| 8051 | Description |
| POp,d | write port |
| PIp | read port |
| 80C51 | Description |
| POp,d | write port |
| PIp | read port |
| 0I | idle mode |
| 0S | power down mode |
| 8052 | Description |
| POp,d | write port |
| PIp | read port |
| 80C52 | Description |
| POp,d | write port |
| PIp | read port |
| 0I | idle mode |
| 0S | power down mode |
| 80515 | Description |
| POp,d | write port |
| PIp | read port |
| AIa,r | read analog |
| 80C515 | Description |
| POp,d | write port |
| PIp | read port |
| AIa,r | read analog |
| 0I | idle mode |
| 0S | power down mode |
| 80C515A | Description |
| POp,d | write port |
| PIp | read port |
| AIa | read analog |
| XE | enable xram |
| 0I | idle mode |
| 0S | power down mode |
| 0De | slow down or normal |
| 80C552 | Description |
| POp,d | write port |
| PIp | read port |
| APp | pwm prescaler |
| AOr,r | pwm output |
| AIa | read analog |
| ICc | set I2C clock |
| IAa | set address for I1, I2 and IR |
| I1d | transmit as master 1 byte |
| I2d,d | transmit as master 2 bytes |
| IR | receive as master |
| ISa,d | transmit/receive as slave |
| 0I | idle mode |
| 0S | power down mode |
| 80C652 | Description |
| POp,d | write port |
| PIp | read port |
| ICc | set I2C clock |
| IAa | set address for I1, I2 and IR |
| I1d | transmit as master 1 byte |
| I2d,d | transmit as master 2 bytes |
| IR | receive as master |
| ISa,d | transmit/receive as slave |
| 0I | idle mode |
| 0S | power down mode |
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