Filter
Top Products
Chapter 18 Version 1 ColdFire Debug (CF1_DEBUG)
MCF51QE128 MCU Series Reference Manual, Rev. 3
Freescale Semiconductor 419
Get the latest version from freescale.com
The move-to-SR, STLDSR, and RTE instructions include an optional PST = 0x3 value, indicating an entry
into user mode.
Similar to the exception processing mode, the stopped state (PST = 0x1E) and the halted state
(PST = 0x1F) display this status for two entries when the ColdFire processor enters the given mode.
18.4.4 Freescale-Recommended BDM Pinout
Typically, a relatively simple interface pod is used to translate commands from a host computer into
commands for the custom serial interface to the single-wire background debug system. Depending on the
development tool vendor, this interface pod may use a standard RS-232 serial port, a parallel printer port,
or some other type of communications such as a universal serial bus (USB) to communicate between the
host PC and the pod. The pod typically connects to the target system with ground, the BKGD pin, RESET,
and sometimes V
DD
. An open-drain connection to reset allows the host to force a target system reset,
useful to regain control of a lost target system or to control startup of a target system before the on-chip
nonvolatile memory has been programmed. Sometimes V
DD
can be used to allow the pod to use power
from the target system to avoid the need for a separate power supply. However, if the pod is powered
separately, it can be connected to a running target system without forcing a target system reset or otherwise
disturbing the running application program.
Figure 25. Recommended BDM Connector
Table 18-28. PST/DDATA Specification for Supervisor-Mode Instructions
Instruction Operand Syntax PST/DDATA
halt PST = 0x01,
PST = 0x0F
move.l Ay,USP PST = 0x01
move.l USP,Ax PST = 0x01
move.w SR,Dx PST = 0x01
move.w {Dy,#<data>},SR PST = 0x01, {PST = 0x03}
movec.l Ry,Rc PST = 0x01
rte PST = 0x07, {PST = 0x0B, DD = source operand}, {PST = 0x03}, {PST = 0x0B,
DD = source operand},
PST = 0x05, {[PST = 0x0{DE}], DD = target address}
stldsr.w #imm PST = 0x01, {PST = 0x0A, DD = destination operand, PST = 0x03}
stop #<data> PST = 0x01,
PST = 0x1E
wdebug.l <ea>y PST = 0x01, {PST = 0x0B, DD = source, PST = 0x0B, DD = source}
BKGD
No Connect
No Connect
1
3
5
GND
RESET
V
DD
2
4
6