MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 756

• 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

22.2 JTAG Signal Descriptions
MPC555
USER’S MANUAL
The MPC555 / MPC556 has five dedicated JTAG pins, which are described in
22-1. The TDI and TDO scan ports are used to scan instructions as well as data into
the various scan registers for JTAG operations. The scan operation is controlled by the
test access port (TAP) controller, which in turn is controlled by the TMS input se-
quence.
To enable JTAG on reset for board test, bit 11 (DGPC select JTAG pins) and bit 16
(PRPM peripheral mode enable) of the reset configuration word should be held high
during the rising edge of reset (see
need to be configurable on the user board to allow JTAG test of a board. To allow nor-
mal operation of the board these bits need to be low in the reset configuration word.
/
MPC556
TCK
TMS
TDI
Figure 22-2 Test Logic Block Diagram
IEEE 1149.1-COMPLIANT INTERFACE (JTAG)
JCOMP
Instruction apply & decode register
TAP CONTROLLER
3
Bypass
4-bit Instruction register
Boundary scan register
2
Rev. 15 October 2000
1
7.5.2 Hard Reset Configuration
0
TRST
M
U
X
M
U
X
TDO
Word). These
MOTOROLA
Table
22-2