Renesas M16C/6V Manual de usuario descargar pdf (Pagina 8)

FLASHER 5 Manual 8

Serial programming, technical details for M16C/6x, M16C/80, R32C

Serial programming uses a clock synchronous interface. 8 bits of data (1 byte) is transferred at a time. The

commands which are used are described in the Renesas manuals. In general, the sequence is as follows:

FLASHER resets the target system by pulling the /Reset line low for a period of time which is set as Reset

active time in Options|Setup dialog of PC program.

FLASHER waits for the Reset inactive time, nominal 500 ms, (t

RD) in order to allow the target system to re-

cover from reset. This time can also be set in Options|Setup dialog via PC program.

FLASHER checks the BUSY line. If it is active (high level) FLASHER stops with error message

40: Target chip says "BUSY" because it can not communicate with the target system

FLASHER outputs one clock (clock changes from high to low and back). BUSY should now be active (high).

If it is not active, FLASHER stops with error message 41: Target chip: Busy does not react

FLASHER outputs 7 more data bits ( 7 clock cycles) and waits for BUSY to go low.

More data bytes are output (or read) the same way.

Reset

BUSY

SCLK

TxD

RxD

dhh

dsu

dhl

high

RL : nominal 20 ms

RD : nominal 500 ms

The reset active time (t

RL) and

reset inactive (eg reset delay)

time (t

RD) can be set in Op-

tions|Setup dialog if required.

Serial target interface circuitry

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Renesas M16C/6V Manual de usuario Pagina 8