MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 734

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

21.5.6.5 Development Port Serial Communications — Trap Enable Mode
21.5.6.6 Serial Data into Development Port — Trap Enable Mode
MPC555
USER’S MANUAL
Start
Table 21-11 Debug Port Command Shifted Into Development Port Shift Register
Start
1
When in not in debug mode the development port starts communications by setting
DSDO (the MSB of the 35-bit development port shift register) low to indicate that all
activity related to the previous transmission are complete and that a new transmission
may begin. The start of a serial transmission from an external development tool to the
development port is signaled by a start bit. A mode bit in the transmission defines the
transmission as either a trap enable mode transmission or a debug mode transmis-
sion. If the mode bit is set the transmission will only be 10 bits long and only seven
data bits will be shifted into the shift register. These seven bits will be latched into the
TECR. A control bit determines whether the data is latched into the trap enable and
VSYNC bits of the TECR or into the breakpoints bits of the TECR.
The development port shift register is 35 bits wide but trap enable mode transmissions
only use the start/ready bit, a mode/status bit, a control/status bit, and the seven least
significant data bits. The encoding of data shifted into the development port shift reg-
ister (through the DSDI pin) is shown in
1
The watchpoint trap enables and VSYNC functions are described in section
Watchpoints and Breakpoints Support
Table 21-10 Trap Enable Data Shifted into Development Port Shift Register
/
Mode
Mode
MPC556
1
1
Con-
Con-
trol
trol
1
0
1st
Extended
x
0
1
1
x
x
x
0
1
Opcode
- - - - - - Instruction- - - - - -
2nd
x
x
0
1
x
0
1
x
x
Watchpoint Trap Enables
DEVELOPMENT SUPPORT
Major Opcode
00100... 11110 Reserved
Rev. 15 October 2000
0 = disabled; 1 = enabled
3rd
00000
00001
00010
00011
00011
00011
11111
11111
11111
11111
Table 21-10
4th
and section
NOP
Hard Reset request
Soft Reset request
Reserved
End Download procedure
Start Download procedure
Negate Maskable breakpoint.
Assert Maskable breakpoint.
Negate Non Maskable breakpoint.
Assert Non Maskable breakpoint.
1st
- - Data- -
and
21.2 Program Flow
2nd
Table 21-11
Function
VSYNC
Transfer Data to
Trap Enable
Control Register
below:
Function
MOTOROLA
Tracking.
21-38
21.3