Hi,
I read up SH7058 Hardware manual, it documented on Boot Mode..the communication is using the InChip SCI(Sericial communication interface) to do the data transfer.nothing mentioned on the watchdog.
I dont quite understand why Watchdog signal is required when the hardware manual didnt mention anything on watchdog signal requirement under boot mode hardware setup.
From the SHBOOT Reference circuit,there is 125HZ feeding to PB15. PB15 can be configured for SCK3(external clock source for Serial communication). However the manual quoted, the reference clock needs to be at 16x of baud rate..with SHBOOT reference circuit with 125HZ feeding to PB15 pin,it doesnt make sense that external clock is used as the clock rate is too low for any serial communication.
regards,
kaileong