rej06b0715_h8sap| Application Note
APPLICATION NOTE
H8S Family
Using the User Branch Function to Clear External WDT during Flash Memory Programming/Erasing
Introduction
The user branch function enables the execution of a user processing routine once every processing unit of a predetermined size during flash-memory programming or erasing. The flash-memory programming/erasing processing consists of several steps, including the application of programming pulses and reading for verification. The user branch function can be used to execute a user processing routine in the intervals between these steps. The sample task of this application note shows how to use the user branch function to clear an external watchdog timer (external WDT) and thus avoid an MCU reset during the erasure of flash memory.
Target Device
H8S/2378R
Preface
Other than the target device indicated above, the program covered in this application note can be run on H8S devices that have the same I/O registers as those employed by the program. However, since some functional modules may be changed for the addition of functionality etc., be sure to perform a thorough evaluation by confirming the details with the hardware manual for the actual target device.
Contents
1. 2. 3. 4. 5. 6. Specifications .................................................................................................................................... 2 Applicable Conditions ....................................................................................................................... 2 Description of Modules Used ............................................................................................................ 3 Principles of Operation...................................................................................................................... 6 Description of Software..................................................................................................................... 8 Documents for Reference ............................................................................................................... 32
REJ06B0715-0100/Rev.1.00
March 2008
Page 1 of 34
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