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22.
Flash Memory Operation
22.4
Programming in the User Boot Mode
22.4.2
(1-B) Procedure that a Programming Routine is transferred from External Host
22.4.2.1
used to transfer data. Then suitable circuit design and program are created. Before installing the device
on a printed circuit board, write the following two program routines into an arbitrary flash block using pro-
gramming equipment such as a flash writer.
2019-02-06
Step-1
A user determines the conditions (e.g., pin status) to enter the user boot mode and the I/O bus to be
(a) Mode determination routine:
(b) Transfer routine:
In addition, prepare a reprogramming routine shown below must be stored on the host controller.
(c) Reprogramming routine:
TMPM3V6/M3V4
Flash memory
Old application
program code
[Reset procedure]
(a) Mode judgment routine
(b) Transfer routine
A program to determine to switch to reprogramming operation
A program to obtain a reprogramming program from the external device.
A program to reprogram data
(Host)
New application
program code
(c) Programming routine
(I/O)
RAM
Page 484
TMPM3V6/M3V4
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