Signal Descriptions
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
2-31
•
Drive JCOMP/RSTI high
Nexus mode is exited by:
•
Hold JCOMP/RSTI low to reset Nexus port
•
Hold TMS/EVTI high to disable Nexus mode at least 4 clocks before driving JCOMP/RSTI high
•
Drive JCOMP/RSTI high
Figure 2-6. Debug Mode Selection (Nexus)
2.6
Reset State
During reset, a 130-µA (maximum) resistor “weakly pulls” all input signals, with the exception of the
power-supply and clock-related signals, to a value based on conditions described in
.” In reset state, all I/O signals become inputs, and all outputs (except for
CLKOUT, HRESET, and SRESET) are pulled only by the pull-up/pull-down.
2.6.1
Signal Functionality Configuration Out of Reset
The reset configuration word (RCW) defines the post-reset functionality of some multiplexed signals. For
details on these signals and how they are configured, refer to Section 7.5.2, “Hard Reset Configuration
Word.”
The 2.6-V bus related signals have selectable output buffer drive strengths that are controlled by the COM0
bit in the USIU’s system clock and reset control register (SCCR). The control is as follows:
0 = 2.6-V bus signals full drive (50-pF load)
1 = 2.6-V bus signals reduced drive (25-pF load)
2.6.2
Signal State During Reset
While HRESET is asserted, the reset-configuration value is latched from the data bus into various bits on
the part. The function of many signals depends upon the value latched. If the value on the data bus changes,
then the function of various signals may also change. This is especially true if the reset configuration word
(RCW) comes from the Flash, because the Flash does not drive the RCW until 256 clocks after the start of
PORESET/TRST
JCOMP/RSTI
T
TMS/EVTI
Nexus On
Nexus Off
Enable and
Configure Nexus
MDI0
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...