MC96FR116C
178
November, 2018 Rev.1.8
14.2.3 Connection of transmission
Two-pin interface connection uses open-drain (wired-AND bidirectional I/O).
DSCL(Debugger Serial Clock Line)
DSDA(Debugger Serial Data Line)
Host Machine(Master)
Target Device(Slave)
VDD
VDD
Current source for DSCL to fast 0 to 1 transition in high speed mode
pull
-
up
resistors
Rp
Rp
VDD
DSCL
IN
DSDA
IN
DSCL
IN
DSDA
IN
Start wait
start HIGH
Host PC
DSCL OUT
Target
Device
DSCL OUT
DSCL
wait HIGH
Maximum
5 T
SCLK
Internal Operation
Acknowledge bit
transmission
minimum 1 T
SCLK
for next byte
transmission
Acknowledge bit
transmission
Minimum 500ns
Figure 14-7 Clock synchronization during wait procedure
Figure 14-8 Wire connection for serial communication