SH7041A datasheet(80/923 Pages) RENESAS

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1.4

The F-ZTAT Version Onboard Programming

There are 2 modes on the F-ZTAT version: a mode that writes and overwrites programs using the

special writer and a mode that writes and overwrites programs onboard the application system.

When rebooting after setting each mode pin and FWP pin during the reset condition, the

microcomputer will transfer to one of the modes indicated in figure 1.6. In the user mode, data can

be read from the flash memory but cannot be written or deleted. Use the boot mode and the user

program mode to write to the flash memory or delete data.

In the boot mode, SCI1 (TXD1, RXD1) is used for data transfer. It is possible to automatically

adjust the transfer bit rate to the transfer bit rate of the host.

Table 1.8

Pins during the Onboard Programming Mode

Notation

I/O

Function

FWP

Input

Hardware protected flash memory write/delete

MD1

Input

User programming mode/boot mode setting

MD2

Input

Clock mode (PLL) setting

MD3

Input

Clock mode (PLL) setting

TxD1

Output

Serial sent data output

RxD1

Input

Serial receive data input

User mode

Power-on

reset condition

User

program

mode

Boot mode

Onboard programming mode

FWP=1

MD1

=1, F

WP=

RES

FWP=0

Notes: For transferring between user mode and user program mode,

proceed while CPU is not programming or erasing the flash

memory.

* RAM emulation permitted

Figure 1.6 Condition Transfer for Flash Memory

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