
24-82
MPC561/MPC563 Reference Manual
MOTOROLA
RCPU Development Access
Figure 24-78. RCPU Development Access Multiplexing between READI and
BDM Signals
24.14.1
RCPU Development Access Messaging
The following RCPU development access messages are used for handshaking between the
device and the tool — DSDI data message, DSDO data message, and BDM status message.
24.14.1.1 DSDI Message
The DSDI message is used by the tool to download information to the RCPU.
The DSDI data field has a 3-bit status header followed by 7 or 32 bits of data/instruction,
depending on the RCPU development port mode.
The DSDI message has the following format:
READI
USIU
JTAG
RCPU
TCK / DSCK / MCKI
TDO / DSDO / MDO0
TDI / DSDI / MDI0
Multiplexer
DS
C
K
DSDI
DSDO
R
C
PU
dev
el
opm
en
t
M
u
x
C
ontr
o
l
Debug
Development
Access
BDM
signals
.
. .
. .
.