Motorola M68CPU32BUG Manual de usuario Pagina 29

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DEBUG MONITOR DESCRIPTION
M68CPU32BUG/D REV 1 2-13
The valid function code mnemonics are:
Function Code Mnemonic Description
0 F0 Unassigned, reserved
1 UD User Data
2 UP User Program
3 F3 Unassigned, reserved
4 F4 Unassigned, reserved
5 SD Supervisor Data
6 SP Supervisor Program
7 CS CPU Space Cycle
The BR, GD, GO, and GT commands set the valid function codes to either a user program (UP)
or supervisor program (SP). When execution is started via GO, GN, or GD, the default address
space is determined by bit 13 (the S-bit) of the status register (SR). When set, SP is used; when
cleared, UP is used. By specifying a function code with GO, GT, or GD command, the SR S-bit
is forced to the correct state before execution begins.
For the GT command, the temporary breakpoint is set using the function code specified, or it
defaults to SP or UP, depending on the state of the S-bit in the SR.
Though function codes are supported, the BCC hardware does not require function codes to
operate.
EXAMPLE To change data at location $5000 in the user data space.
CPU32Bug>m 5000^ud<CR>
00005000^UD 0000 ? 1234.<CR>
CPU32Bug>
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