M38042F1HKP datasheet(91/116 Pages) RENESAS

91 / 116 page

Rev.1.01

Jan 25, 2005

page 91 of 114

REJ03B0131-0101Z

3804 Group (Spec. H)

q Standard serial I/O Mode

The standard serial I/O mode inputs and outputs the software

commands, addresses and data needed to operate (read, pro-

gram, erase, etc.) the internal flash memory. This I/O is clock

synchronized serial. This mode requires a purpose-specific pe-

ripheral unit.

The standard serial I/O mode is different from the parallel I/O

mode in that the CPU controls flash memory rewrite (uses the

CPU rewrite mode), rewrite data input and so forth. The standard

serial I/O mode is started by connecting “H” to the CNVss pin and

“H” to the P45 (BOOTENT) pin, and releasing the reset operation.

(In the ordinary microcomputer mode, set CNVss pin to “L” level.)

This control program is written in the Boot ROM area when the

product is shipped from Renesas. Accordingly, make note of the

fact that the standard serial I/O mode cannot be used if the Boot

ROM area is rewritten in parallel I/O mode. The standard serial I/

O mode has standard serial I/O mode 1 of the clock synchronous

serial and standard serial I/O mode 2 of the clock asynchronous

serial. Tables 17 and 18 show description of pin function (standard

serial I/O mode). Figures 87 to 90 show the pin connections for

the standard serial I/O mode.

In standard serial I/O mode, only the User ROM area shown in

Figure 77 can be rewritten. The Boot ROM area cannot be written.

In standard serial I/O mode, a 7-byte ID code is used. When there

is data in the flash memory, this function determines whether the

ID code sent from the peripheral unit (programmer) and those writ-

ten in the flash memory match. The commands sent from the

peripheral unit (programmer) are not accepted unless the ID code

matches.

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