Development Support
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
23-33
Figure 23-11. Enabling Clock Mode Following Reset
23.4.6.5
Development Port Serial Communications — Trap Enable Mode
When 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 transmission. 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.
23.4.6.6
Serial Data into Development Port — Trap Enable Mode
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 register (through the DSDI pin) is shown in
and
below:
DSDI
CLKOUT
SRESET
DSDI negates following SRESET negation
CLKEN
Internal clock enable signal asserts 8 clocks after SRESET
negation if DSDI is negated. This enables clocked mode.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
First Start bit detected after DSDI negation (self clocked mode)
to enable clocked mode.
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...