A96G140/A96G148/A96A148 User’s manual
20 Development tools
261
Packet transmission timing
Figure 139 shows a timing diagram of a packet transmission using the OCD communication protocol.
A start bit in the figure means start of a packet and is valid when the
DSDA falls from ‘H’ to ‘L’ while
External Host maintains the
DSCL to ‘H’. After
the valid start bit, communication data is transferred and
received between a Host and a microcontroller.
An end bit means end of the data transmission and is valid when the
DSDA changes from ‘L’ to ‘H’
while a Debugger maintains the
DSCL to ‘H’. Next, the microcontroller places the bus in a wait state
and processes the received data.
Figure 139. Data Transfer on OCD